Repository: fork-tongue/observ (language: python)

Issue:
Minimize deps
E.g. dict.copy causes depend to be called for the dict dep and all its keydeps, where only the dict dep would be sufficient.

This mostly matters in eager mode but in general it would shave off some redundant function calls


Discussion / hints:
Added a unit test to verify that we don't trigger redundant recomputations. That's a relief. See https://github.com/Korijn/observ/blob/master/tests/test_deps.py#L4

Fix patch:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..6a9eeea
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,17 @@
+repos:
+- repo: local
+  hooks:
+  - id: flake8
+    name: Linting
+    entry: poetry run flake8
+    language: system
+    types: [python]
+    require_serial: true
+- repo: local
+  hooks:
+  - id: pytest
+    name: Tests
+    entry: poetry run pytest
+    language: system
+    types: [python]
+    pass_filenames: false
diff --git a/README.md b/README.md
index 08aa64e..12ae9c9 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 # Observ 👁
 
-Observ is a Python port of [Vue.js](https://vuejs.org/)' [computed properties and watchers](https://vuejs.org/v2/guide/computed.html). It is completely event loop/framework agnostic and has no dependencies so it can be used in any project targeting Python >= 3.6.
+Observ is a Python port of [Vue.js](https://vuejs.org/)' [computed properties and watchers](https://v3.vuejs.org/api/basic-reactivity.html). It is completely event loop/framework agnostic and has no dependencies so it can be used in any project targeting Python >= 3.6.
 
 Observ provides the following two benefits for stateful applications:
 
@@ -17,11 +17,11 @@ Observ provides the following two benefits for stateful applications:
 
 ## API
 
-`from observ import observe, computed, watch`
+`from observ import reactive, computed, watch`
 
-* `state = observe(state)`
+* `state = reactive(state)`
 
-Observe nested structures of dicts, lists, tuples and sets. Returns an observable clone of the state input object.
+Observe nested structures of dicts, lists, tuples and sets. Returns an observable proxy that wraps the state input object.
 
 * `watcher = watch(func, callback, deep=False, immediate=False)`
 
@@ -38,3 +38,7 @@ Install observ with pip/pipenv/poetry:
 `pip install observ`
 
 Check out [`examples/observe_qt.py`](https://github.com/Korijn/observ/blob/master/examples/observe_qt.py) for a simple example using observ.
+
+## Caveats
+
+Observ keeps references to the object passed to the `reactive` in order to keep track of dependencies and proxies for that object. When the object that is passed into `reactive` is not managed by other code, then observ should cleanup its references automatically when the proxy is destroyed. However, if there is another reference to the original object, then observ will only release its own reference when the garbage collector is run and all other references to the object are gone.
diff --git a/examples/observe_qt.py b/examples/observe_qt.py
index 2258ade..6442f74 100644
--- a/examples/observe_qt.py
+++ b/examples/observe_qt.py
@@ -19,7 +19,7 @@
     QWidget,
 )
 
-from observ import observe, scheduler, watch
+from observ import reactive, scheduler, watch
 
 
 class Display(QWidget):
@@ -122,7 +122,7 @@ def on_reset_clicked(self):
 
 if __name__ == "__main__":
     # Define some state
-    state = observe({"clicked": 0, "progress": 0})
+    state = reactive({"clicked": 0, "progress": 0})
 
     app = QApplication([])
 
diff --git a/observ/api.py b/observ/api.py
index fbe3a17..0148b40 100644
--- a/observ/api.py
+++ b/observ/api.py
@@ -1,15 +1,24 @@
 """
 Defines the public API for observ users
 """
-from functools import wraps
+from functools import partial, wraps
 
 from .dep import Dep
-from .observables import observe
+from .observables import proxy, to_raw
 from .scheduler import scheduler
 from .watcher import Watcher
 
 
-__all__ = ("observe", "computed", "watch", "scheduler")
+__all__ = (
+    "reactive",
+    "readonly",
+    "shallow_reactive",
+    "shallow_readonly",
+    "computed",
+    "watch",
+    "scheduler",
+    "to_raw",
+)
 
 
 def computed(fn):
@@ -35,3 +44,9 @@ def watch(fn, callback, sync=False, deep=False, immediate=False):
         if watcher.callback:
             watcher.run_callback(watcher.value, None)
     return watcher
+
+
+reactive = proxy
+readonly = partial(proxy, readonly=True)
+shallow_reactive = partial(proxy, shallow=True)
+shallow_readonly = partial(proxy, shallow=True, readonly=True)
diff --git a/observ/dep.py b/observ/dep.py
index 972548a..e024b80 100644
--- a/observ/dep.py
+++ b/observ/dep.py
@@ -10,7 +10,7 @@ class Dep:
     stack: List["Watcher"] = []  # noqa: F821
 
     def __init__(self) -> None:
-        self._subs = WeakSet()
+        self._subs: WeakSet["Watcher"] = WeakSet()  # noqa: F821
 
     def add_sub(self, sub: "Watcher") -> None:  # noqa: F821
         self._subs.add(sub)
diff --git a/observ/observables.py b/observ/observables.py
index c47ffed..3b9329e 100644
--- a/observ/observables.py
+++ b/observ/observables.py
@@ -2,153 +2,378 @@
 observe converts plain datastructures (dict, list, set) to
 proxied versions of those datastructures to make them reactive.
 """
-from functools import wraps
+from copy import copy
+from functools import partial, wraps
+import gc
 import sys
+from weakref import WeakValueDictionary
 
 from .dep import Dep
 
 
-def observe(obj, deep=True):
-    """Please be aware: this only works on plain data types!"""
-    if not isinstance(obj, (dict, list, tuple, set)):
-        return obj  # common case first
-    elif isinstance(obj, dict):
-        if not isinstance(obj, ObservableDict):
-            reactive = ObservableDict(obj)
-        else:
-            reactive = obj
-        if deep:
-            for k, v in reactive.items():
-                reactive[k] = observe(v)
-        return reactive
-    elif isinstance(obj, list):
-        if not isinstance(obj, ObservableList):
-            reactive = ObservableList(obj)
+class ProxyDb:
+    """
+    Collection of proxies, tracked by the id of the object that they wrap.
+    Each time a Proxy is instantiated, it will register itself for the
+    wrapped object. And when a Proxy is deleted, then it will unregister.
+    When the last proxy that wraps an object is removed, it is uncertain
+    what happens to the wrapped object, so in that case the object id is
+    removed from the collection.
+    """
+
+    def __init__(self):
+        self.db = {}
+        gc.callbacks.append(self.cleanup)
+
+    def cleanup(self, phase, info):
+        """
+        Callback for garbage collector to cleanup the db for targets
+        that have no other references outside of the db
+        """
+        # TODO: maybe also run on start? Check performance
+        if phase != "stop":
+            return
+
+        keys_to_delete = []
+        for key, value in self.db.items():
+            # Refs:
+            # - sys.getrefcount
+            # - ref in db item
+            if sys.getrefcount(value["target"]) <= 2:
+                # We are the last to hold a reference!
+                keys_to_delete.append(key)
+
+        for keys in keys_to_delete:
+            del self.db[keys]
+
+    def reference(self, proxy):
+        """
+        Adds a reference to the collection for the wrapped object's id
+        """
+        obj_id = id(proxy.target)
+
+        if obj_id not in self.db:
+            attrs = {
+                "dep": Dep(),
+            }
+            if isinstance(proxy.target, dict):
+                attrs["keydep"] = {key: Dep() for key in proxy.target.keys()}
+            self.db[obj_id] = {
+                "target": proxy.target,
+                "attrs": attrs,  # dep, keydep
+                # keyed on tuple(readonly, shallow)
+                "proxies": WeakValueDictionary(),
+            }
+
+        # Use setdefault to put the proxy in the proxies dict. If there
+        # was an existing value, it will return that instead. There shouldn't
+        # be an existing value, so we can compare the objects to see if we
+        # should raise an exception.
+        # Seems to be a tiny bit faster than checking beforehand if
+        # there is already an existing value in the proxies dict
+        result = self.db[obj_id]["proxies"].setdefault(
+            (proxy.readonly, proxy.shallow), proxy
+        )
+        if result is not proxy:
+            raise RuntimeError("Proxy with existing configuration already in db")
+
+    def dereference(self, proxy):
+        """
+        Removes a reference from the database for the given proxy
+        """
+        obj_id = id(proxy.target)
+        if obj_id not in self.db:
+            # When there are failing tests, it might happen that proxies
+            # are garbage collected at a point where the proxy_db is already
+            # cleared. That's why we need this check here.
+            # See fixture [clear_proxy_db](/tests/conftest.py:clear_proxy_db)
+            # for more info.
+            return
+
+        # The given proxy is the last proxy in the WeakValueDictionary,
+        # so now is a good moment to see if can remove clean the deps
+        # for the target object
+        if len(self.db[obj_id]["proxies"]) == 1:
+            ref_count = sys.getrefcount(self.db[obj_id]["target"])
+            # Ref count is still 3 here because of the reference through proxy.target
+            if ref_count <= 3:
+                # We are the last to hold a reference!
+                del self.db[obj_id]
+
+    def attrs(self, proxy):
+        return self.db[id(proxy.target)]["attrs"]
+
+    def get_proxy(self, target, readonly=False, shallow=False):
+        """
+        Returns a proxy from the collection for the given object and configuration.
+        Will return None if there is no proxy for the object's id.
+        """
+        if id(target) not in self.db:
+            return None
+        return self.db[id(target)]["proxies"].get((readonly, shallow))
+
+
+# Create a global proxy collection
+proxy_db = ProxyDb()
+
+
+class Proxy:
+    """
+    Proxy for an object/target.
+
+    Instantiating a Proxy will add a reference to the global proxy_db and
+    destroying a Proxy will remove that reference.
+
+    Please use the `proxy` method to get a proxy for a certain object instead
+    of directly creating one yourself. The `proxy` method will either create
+    or return an existing proxy and makes sure that the db stays consistent.
+    """
+
+    __hash__ = None
+
+    def __init__(self, target, readonly=False, shallow=False):
+        self.target = target
+        self.readonly = readonly
+        self.shallow = shallow
+        proxy_db.reference(self)
+
+    def __del__(self):
+        proxy_db.dereference(self)
+
+
+def proxy(target, readonly=False, shallow=False):
+    """
+    Returns a Proxy for the given object. If a proxy for the given
+    configuration already exists, it will return that instead of
+    creating a new one.
+
+    Please be aware: this only works on plain data types!
+    """
+    # The object may be a proxy already, so check if it matches the
+    # given configuration (readonly and shallow)
+    if isinstance(target, Proxy):
+        if readonly == target.readonly and shallow == target.shallow:
+            return target
         else:
-            reactive = obj
-        if deep:
-            for i, v in enumerate(reactive):
-                reactive[i] = observe(v)
-        return reactive
-    elif isinstance(obj, tuple):
-        reactive = obj  # tuples are immutable
-        if deep:
-            reactive = tuple(observe(v) for v in reactive)
-        return reactive
-    elif isinstance(obj, set):
-        if deep:
-            return ObservableSet(observe(v) for v in obj)
+            # If the configuration does not match,
+            # unwrap the target from the proxy so that the right
+            # kind of proxy can be returned in the next part of
+            # this function
+            target = target.target
+
+    # Note that at this point, target is always a non-proxy object
+    # Check the proxy_db to see if there's already a proxy for the target object
+    existing_proxy = proxy_db.get_proxy(target, readonly=readonly, shallow=shallow)
+    if existing_proxy is not None:
+        return existing_proxy
+
+    # We can only wrap the following datatypes
+    if not isinstance(target, (dict, list, tuple, set)):
+        return target
+
+    # Otherwise, create a new proxy
+    proxy_type = None
+    if isinstance(target, dict):
+        proxy_type = DictProxy if not readonly else ReadonlyDictProxy
+    elif isinstance(target, list):
+        proxy_type = ListProxy if not readonly else ReadonlyListProxy
+    elif isinstance(target, set):
+        proxy_type = SetProxy if not readonly else ReadonlySetProxy
+    elif isinstance(target, tuple):
+        return tuple(proxy(x, readonly=readonly, shallow=shallow) for x in target)
+    return proxy_type(target, readonly=readonly, shallow=shallow)
+
+
+class StateModifiedError(Exception):
+    """
+    Raised when a proxy is modified in a watched (or computed) expression.
+    """
+
+    pass
+
+
+def read_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def trap(self, *args, **kwargs):
+        if Dep.stack:
+            proxy_db.attrs(self)["dep"].depend()
+        value = fn(self.target, *args, **kwargs)
+        if self.shallow:
+            return value
+        return proxy(value, readonly=self.readonly)
+
+    return trap
+
+
+def iterate_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def trap(self, *args, **kwargs):
+        if Dep.stack:
+            proxy_db.attrs(self)["dep"].depend()
+        iterator = fn(self.target, *args, **kwargs)
+        if self.shallow:
+            return iterator
+        if method == "items":
+            return (
+                (key, proxy(value, readonly=self.readonly)) for key, value in iterator
+            )
         else:
-            if not isinstance(obj, ObservableSet):
-                reactive = ObservableSet(obj)
-            else:
-                reactive = obj
-            return reactive
-
-
-def make_observable(cls):
-    def read(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            if Dep.stack:
-                self.__dep__.depend()
-            return fn(self, *args, **kwargs)
-
-        return inner
-
-    def read_key(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            if Dep.stack:
-                key = args[0]
-                self.__keydeps__[key].depend()
-            return fn(self, *args, **kwargs)
-
-        return inner
-
-    def write(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            args = tuple(observe(a) for a in args)
-            kwargs = {k: observe(v) for k, v in kwargs.items()}
-            retval = fn(self, *args, **kwargs)
-            # TODO prevent firing if value hasn't actually changed?
-            self.__dep__.notify()
-            return retval
-
-        return inner
-
-    def write_key(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            key = args[0]
-            is_new = key not in self.__keydeps__
-            old_value = cls.__getitem__(self, key) if not is_new else None
-            args = [key] + [observe(a) for a in args[1:]]
-            kwargs = {k: observe(v) for k, v in kwargs.items()}
-            retval = fn(self, *args, **kwargs)
-            new_value = cls.__getitem__(self, key)
-            if is_new:
-                self.__keydeps__[key] = Dep()
-            if old_value != new_value:
-                self.__keydeps__[key].notify()
-                self.__dep__.notify()
-            return retval
-
-        return inner
-
-    def delete(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            retval = fn(self, *args, **kwargs)
-            self.__dep__.notify()
-            for key in self._orphaned_keydeps():
-                self.__keydeps__[key].notify()
-                del self.__keydeps__[key]
-            return retval
-
-        return inner
-
-    def delete_key(fn):
-        @wraps(fn)
-        def inner(self, *args, **kwargs):
-            retval = fn(self, *args, **kwargs)
+            proxied = partial(proxy, readonly=self.readonly)
+            return map(proxied, iterator)
+
+    return trap
+
+
+def read_key_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        if Dep.stack:
             key = args[0]
-            self.__dep__.notify()
-            self.__keydeps__[key].notify()
-            del self.__keydeps__[key]
-            return retval
+            proxy_db.attrs(self)["keydep"][key].depend()
+        value = fn(self.target, *args, **kwargs)
+        if self.shallow:
+            return value
+        return proxy(value, readonly=self.readonly)
 
-        return inner
+    return inner
 
-    todo = [
-        ("_READERS", read),
-        ("_KEYREADERS", read_key),
-        ("_WRITERS", write),
-        ("_KEYWRITERS", write_key),
-        ("_DELETERS", delete),
-        ("_KEYDELETERS", delete_key),
-    ]
 
-    for category, decorate in todo:
-        for name in getattr(cls, category, set()):
-            fn = getattr(cls, name)
-            setattr(cls, name, decorate(fn))
+def write_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
 
-    return cls
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        if Dep.stack:
+            raise StateModifiedError()
+        args = tuple(proxy(a) for a in args)
+        kwargs = {k: proxy(v) for k, v in kwargs.items()}
+        retval = fn(self.target, *args, **kwargs)
+        # TODO: prevent firing if value hasn't actually changed?
+        proxy_db.attrs(self)["dep"].notify()
+        return retval
 
+    return inner
 
-class ObservableDict(dict):
-    _READERS = {
-        "values",
+
+def write_key_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+    getitem_fn = getattr(obj_cls, "__getitem__")
+
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        if Dep.stack:
+            raise StateModifiedError()
+        key = args[0]
+        is_new = key not in proxy_db.attrs(self)["keydep"]
+        old_value = getitem_fn(self.target, key) if not is_new else None
+        args = [key] + [proxy(a) for a in args[1:]]
+        kwargs = {k: proxy(v) for k, v in kwargs.items()}
+        retval = fn(self.target, *args, **kwargs)
+        new_value = getitem_fn(self.target, key)
+        if is_new:
+            proxy_db.attrs(self)["keydep"][key] = Dep()
+        if old_value != new_value:
+            proxy_db.attrs(self)["keydep"][key].notify()
+            proxy_db.attrs(self)["dep"].notify()
+        return retval
+
+    return inner
+
+
+def delete_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        if Dep.stack:
+            raise StateModifiedError()
+        retval = fn(self.target, *args, **kwargs)
+        proxy_db.attrs(self)["dep"].notify()
+        for key in self._orphaned_keydeps():
+            proxy_db.attrs(self)["keydep"][key].notify()
+            del proxy_db.attrs(self)["keydep"][key]
+        return retval
+
+    return inner
+
+
+def delete_key_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        if Dep.stack:
+            raise StateModifiedError()
+        retval = fn(self.target, *args, **kwargs)
+        key = args[0]
+        proxy_db.attrs(self)["dep"].notify()
+        proxy_db.attrs(self)["keydep"][key].notify()
+        del proxy_db.attrs(self)["keydep"][key]
+        return retval
+
+    return inner
+
+
+trap_map = {
+    "READERS": read_trap,
+    "KEYREADERS": read_key_trap,
+    "ITERATORS": iterate_trap,
+    "WRITERS": write_trap,
+    "KEYWRITERS": write_key_trap,
+    "DELETERS": delete_trap,
+    "KEYDELETERS": delete_key_trap,
+}
+
+
+class ReadonlyError(Exception):
+    """
+    Raised when a readonly proxy is modified.
+    """
+
+    pass
+
+
+def readonly_trap(method, obj_cls):
+    fn = getattr(obj_cls, method)
+
+    @wraps(fn)
+    def inner(self, *args, **kwargs):
+        raise ReadonlyError()
+
+    return inner
+
+
+trap_map_readonly = {
+    "READERS": read_trap,
+    "KEYREADERS": read_key_trap,
+    "ITERATORS": iterate_trap,
+    "WRITERS": readonly_trap,
+    "KEYWRITERS": readonly_trap,
+    "DELETERS": readonly_trap,
+    "KEYDELETERS": readonly_trap,
+}
+
+
+def bind_traps(proxy_cls, obj_cls, traps, trap_map):
+    for trap_type, methods in traps.items():
+        for method in methods:
+            trap = trap_map[trap_type](method, obj_cls)
+            setattr(proxy_cls, method, trap)
+
+
+dict_traps = {
+    "READERS": {
         "copy",
-        "items",
-        "keys",
         "__eq__",
         "__format__",
         "__ge__",
         "__gt__",
-        "__iter__",
         "__le__",
         "__len__",
         "__lt__",
@@ -156,50 +381,66 @@ class ObservableDict(dict):
         "__repr__",
         "__sizeof__",
         "__str__",
-    }
-    _KEYREADERS = {
+        "keys",
+    },
+    "KEYREADERS": {
         "get",
         "__contains__",
         "__getitem__",
-    }
-    _WRITERS = {
+    },
+    "ITERATORS": {
+        "items",
+        "values",
+        "__iter__",
+    },
+    "WRITERS": {
         "update",
-    }
-    _KEYWRITERS = {
+    },
+    "KEYWRITERS": {
         "setdefault",
         "__setitem__",
-    }
-    _DELETERS = {
+    },
+    "DELETERS": {
         "clear",
         "popitem",
-    }
-    _KEYDELETERS = {
+    },
+    "KEYDELETERS": {
         "pop",
         "__delitem__",
-    }
+    },
+}
+
+if sys.version_info >= (3, 8, 0):
+    dict_traps["ITERATORS"].add("__reversed__")
+if sys.version_info >= (3, 9, 0):
+    dict_traps["READERS"].add("__or__")
+    dict_traps["READERS"].add("__ror__")
+    dict_traps["WRITERS"].add("__ior__")
+
 
-    @wraps(dict.__init__)
-    def __init__(self, *args, **kwargs):
-        dict.__init__(self, *args, **kwargs)
-        self.__dep__ = Dep()
-        self.__keydeps__ = {key: Dep() for key in dict.keys(self)}
+class DictProxyBase(Proxy):
+    def __init__(self, target, readonly=False, shallow=False):
+        super().__init__(target, readonly=readonly, shallow=shallow)
 
     def _orphaned_keydeps(self):
-        return set(self.__keydeps__.keys()) - set(dict.keys(self))
+        return set(proxy_db.attrs(self)["keydep"].keys()) - set(self.target.keys())
 
 
-if sys.version_info >= (3, 8, 0):
-    ObservableDict._READERS.add("__reversed__")
-if sys.version_info >= (3, 9, 0):
-    ObservableDict._READERS.add("__or__")
-    ObservableDict._READERS.add("__ror__")
-    ObservableDict._WRITERS.add("__ior__")
-ObservableDict = make_observable(ObservableDict)
+class DictProxy(DictProxyBase):
+    pass
+
+
+class ReadonlyDictProxy(DictProxyBase):
+    def __init__(self, target, shallow=False, **kwargs):
+        super().__init__(target, shallow=shallow, **{**kwargs, "readonly": True})
+
 
+bind_traps(DictProxy, dict, dict_traps, trap_map)
+bind_traps(ReadonlyDictProxy, dict, dict_traps, trap_map_readonly)
 
-@make_observable
-class ObservableList(list):
-    _READERS = {
+
+list_traps = {
+    "READERS": {
         "count",
         "index",
         "copy",
@@ -214,15 +455,17 @@ class ObservableList(list):
         "__mul__",
         "__ne__",
         "__rmul__",
-        "__iter__",
         "__len__",
         "__repr__",
         "__str__",
         "__format__",
-        "__reversed__",
         "__sizeof__",
-    }
-    _WRITERS = {
+    },
+    "ITERATORS": {
+        "__iter__",
+        "__reversed__",
+    },
+    "WRITERS": {
         "append",
         "clear",
         "extend",
@@ -235,17 +478,30 @@ class ObservableList(list):
         "__delitem__",
         "__iadd__",
         "__imul__",
-    }
+    },
+}
+
+
+class ListProxyBase(Proxy):
+    def __init__(self, target, readonly=False, shallow=False):
+        super().__init__(target, readonly=readonly, shallow=shallow)
 
-    @wraps(list.__init__)
-    def __init__(self, *args, **kwargs):
-        list.__init__(self, *args, **kwargs)
-        self.__dep__ = Dep()
 
+class ListProxy(ListProxyBase):
+    pass
 
-@make_observable
-class ObservableSet(set):
-    _READERS = {
+
+class ReadonlyListProxy(ListProxyBase):
+    def __init__(self, target, shallow=False, **kwargs):
+        super().__init__(target, shallow=shallow, **{**kwargs, "readonly": True})
+
+
+bind_traps(ListProxy, list, list_traps, trap_map)
+bind_traps(ReadonlyListProxy, list, list_traps, trap_map_readonly)
+
+
+set_traps = {
+    "READERS": {
         "copy",
         "difference",
         "intersection",
@@ -263,7 +519,6 @@ class ObservableSet(set):
         "__iand__",
         "__ior__",
         "__isub__",
-        "__iter__",
         "__ixor__",
         "__le__",
         "__len__",
@@ -279,8 +534,11 @@ class ObservableSet(set):
         "__str__",
         "__sub__",
         "__xor__",
-    }
-    _WRITERS = {
+    },
+    "ITERATORS": {
+        "__iter__",
+    },
+    "WRITERS": {
         "add",
         "clear",
         "difference_update",
@@ -290,9 +548,52 @@ class ObservableSet(set):
         "remove",
         "symmetric_difference_update",
         "update",
-    }
+    },
+}
+
+
+class SetProxyBase(Proxy):
+    def __init__(self, target, readonly=False, shallow=False):
+        super().__init__(target, readonly=readonly, shallow=shallow)
+
+
+class SetProxy(SetProxyBase):
+    pass
+
+
+class ReadonlySetProxy(SetProxyBase):
+    def __init__(self, target, shallow=False, **kwargs):
+        super().__init__(target, shallow=shallow, **{**kwargs, "readonly": True})
+
+
+bind_traps(SetProxy, set, set_traps, trap_map)
+bind_traps(ReadonlySetProxy, set, set_traps, trap_map_readonly)
+
+
+def to_raw(target):
+    """
+    Returns a raw object from which any trace of proxy has been replaced
+    with its wrapped target value.
+    """
+    if isinstance(target, Proxy):
+        return to_raw(target.target)
+
+    if isinstance(target, list):
+        tcopy = copy(target)
+        for idx, value in enumerate(tcopy):
+            tcopy[idx] = to_raw(value)
+        return tcopy
+
+    if isinstance(target, dict):
+        target = copy(target)
+        for key, value in target.items():
+            target[key] = to_raw(value)
+        return target
+
+    if isinstance(target, tuple):
+        return tuple(map(to_raw, target))
+
+    if isinstance(target, set):
+        return target
 
-    @wraps(set.__init__)
-    def __init__(self, *args, **kwargs):
-        set.__init__(self, *args, **kwargs)
-        self.__dep__ = Dep()
+    return target
diff --git a/observ/watcher.py b/observ/watcher.py
index 81b4a05..4add93c 100644
--- a/observ/watcher.py
+++ b/observ/watcher.py
@@ -3,7 +3,7 @@
 observable datastructures, and optionally trigger callback when
 a change is detected.
 """
-from collections.abc import Container
+from collections.abc import Container, Mapping
 import inspect
 from itertools import count
 from typing import Any
@@ -14,17 +14,23 @@
 
 
 def traverse(obj):
+    """
+    Recursively traverse the whole tree to make sure
+    that all values have been 'get'
+    """
     _traverse(obj, set())
 
 
-def _traverse(obj, seen):
+def _traverse(obj, seen: set):
     seen.add(id(obj))
-    if isinstance(obj, dict):
+    if isinstance(obj, Mapping):
+        # dict and DictProxies
         val_iter = iter(obj.values())
-    elif isinstance(obj, (list, tuple, set)):
+    elif isinstance(obj, Container):
+        # list, set (and their proxies) and tuple
         val_iter = iter(obj)
     else:
-        val_iter = iter(())
+        return
     for v in val_iter:
         if isinstance(v, Container) and id(v) not in seen:
             _traverse(v, seen)
diff --git a/poetry.lock b/poetry.lock
index 8f6fb2b..601ac71 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,1045 +1,1255 @@
-[[package]]
-name = "appdirs"
-version = "1.4.4"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "atomicwrites"
-version = "1.4.0"
-description = "Atomic file writes."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "attrs"
-version = "21.2.0"
-description = "Classes Without Boilerplate"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
-
-[[package]]
-name = "black"
-version = "20.8b1"
-description = "The uncompromising code formatter."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-appdirs = "*"
-click = ">=7.1.2"
-dataclasses = {version = ">=0.6", markers = "python_version < \"3.7\""}
-mypy-extensions = ">=0.4.3"
-pathspec = ">=0.6,<1"
-regex = ">=2020.1.8"
-toml = ">=0.10.1"
-typed-ast = ">=1.4.0"
-typing-extensions = ">=3.7.4"
-
-[package.extras]
-colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
-
-[[package]]
-name = "bleach"
-version = "4.1.0"
-description = "An easy safelist-based HTML-sanitizing tool."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-packaging = "*"
-six = ">=1.9.0"
-webencodings = "*"
-
-[[package]]
-name = "certifi"
-version = "2021.5.30"
-description = "Python package for providing Mozilla's CA Bundle."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "cffi"
-version = "1.14.6"
-description = "Foreign Function Interface for Python calling C code."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-pycparser = "*"
-
-[[package]]
-name = "charset-normalizer"
-version = "2.0.6"
-description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "dev"
-optional = false
-python-versions = ">=3.5.0"
-
-[package.extras]
-unicode_backport = ["unicodedata2"]
-
-[[package]]
-name = "click"
-version = "8.0.1"
-description = "Composable command line interface toolkit"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-colorama = {version = "*", markers = "platform_system == \"Windows\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-
-[[package]]
-name = "colorama"
-version = "0.4.4"
-description = "Cross-platform colored terminal text."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[[package]]
-name = "coverage"
-version = "5.5"
-description = "Code coverage measurement for Python"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-
-[package.extras]
-toml = ["toml"]
-
-[[package]]
-name = "cryptography"
-version = "3.4.8"
-description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-cffi = ">=1.12"
-
-[package.extras]
-docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx-rtd-theme"]
-docstest = ["doc8", "pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
-pep8test = ["black", "flake8", "flake8-import-order", "pep8-naming"]
-sdist = ["setuptools-rust (>=0.11.4)"]
-ssh = ["bcrypt (>=3.1.5)"]
-test = ["pytest (>=6.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,!=3.79.2)"]
-
-[[package]]
-name = "dataclasses"
-version = "0.8"
-description = "A backport of the dataclasses module for Python 3.6"
-category = "dev"
-optional = false
-python-versions = ">=3.6, <3.7"
-
-[[package]]
-name = "docutils"
-version = "0.17.1"
-description = "Docutils -- Python Documentation Utilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[[package]]
-name = "flake8"
-version = "3.9.2"
-description = "the modular source code checker: pep8 pyflakes and co"
-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[package.dependencies]
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.7.0,<2.8.0"
-pyflakes = ">=2.3.0,<2.4.0"
-
-[[package]]
-name = "flake8-black"
-version = "0.2.3"
-description = "flake8 plugin to call black as a code style validator"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-black = "*"
-flake8 = ">=3.0.0"
-toml = "*"
-
-[[package]]
-name = "flake8-import-order"
-version = "0.18.1"
-description = "Flake8 and pylama plugin that checks the ordering of import statements."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-pycodestyle = "*"
-
-[[package]]
-name = "flake8-print"
-version = "4.0.0"
-description = "print statement checker plugin for flake8"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-flake8 = ">=3.0"
-pycodestyle = "*"
-six = "*"
-
-[[package]]
-name = "idna"
-version = "3.2"
-description = "Internationalized Domain Names in Applications (IDNA)"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[[package]]
-name = "importlib-metadata"
-version = "4.8.1"
-description = "Read metadata from Python packages"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
-zipp = ">=0.5"
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-perf = ["ipython"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
-
-[[package]]
-name = "iniconfig"
-version = "1.1.1"
-description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "jeepney"
-version = "0.7.1"
-description = "Low-level, pure Python DBus protocol wrapper."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.extras]
-test = ["pytest", "pytest-trio", "pytest-asyncio", "testpath", "trio", "async-timeout"]
-trio = ["trio", "async-generator"]
-
-[[package]]
-name = "keyring"
-version = "23.2.1"
-description = "Store and access your passwords safely."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-importlib-metadata = ">=3.6"
-jeepney = {version = ">=0.4.2", markers = "sys_platform == \"linux\""}
-pywin32-ctypes = {version = "<0.1.0 || >0.1.0,<0.1.1 || >0.1.1", markers = "sys_platform == \"win32\""}
-SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
-
-[[package]]
-name = "mccabe"
-version = "0.6.1"
-description = "McCabe checker, plugin for flake8"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "mypy-extensions"
-version = "0.4.3"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "packaging"
-version = "21.0"
-description = "Core utilities for Python packages"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-pyparsing = ">=2.0.2"
-
-[[package]]
-name = "pathspec"
-version = "0.9.0"
-description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[[package]]
-name = "pkginfo"
-version = "1.7.1"
-description = "Query metadatdata from sdists / bdists / installed packages."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.extras]
-testing = ["nose", "coverage"]
-
-[[package]]
-name = "pluggy"
-version = "1.0.0"
-description = "plugin and hook calling mechanisms for python"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-
-[package.extras]
-dev = ["pre-commit", "tox"]
-testing = ["pytest", "pytest-benchmark"]
-
-[[package]]
-name = "py"
-version = "1.10.0"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pycodestyle"
-version = "2.7.0"
-description = "Python style guide checker"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pycparser"
-version = "2.20"
-description = "C parser in Python"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pyflakes"
-version = "2.3.1"
-description = "passive checker of Python programs"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pygments"
-version = "2.10.0"
-description = "Pygments is a syntax highlighting package written in Python."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[[package]]
-name = "pyparsing"
-version = "2.4.7"
-description = "Python parsing module"
-category = "dev"
-optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-
-[[package]]
-name = "pyside6"
-version = "6.1.3"
-description = "Python bindings for the Qt cross-platform application and UI framework"
-category = "dev"
-optional = false
-python-versions = ">=3.6, <3.10"
-
-[package.dependencies]
-shiboken6 = "6.1.3"
-
-[[package]]
-name = "pytest"
-version = "6.2.5"
-description = "pytest: simple powerful testing with Python"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
-attrs = ">=19.2.0"
-colorama = {version = "*", markers = "sys_platform == \"win32\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-iniconfig = "*"
-packaging = "*"
-pluggy = ">=0.12,<2.0"
-py = ">=1.8.2"
-toml = "*"
-
-[package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
-
-[[package]]
-name = "pytest-cov"
-version = "2.12.1"
-description = "Pytest plugin for measuring coverage."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[package.dependencies]
-coverage = ">=5.2.1"
-pytest = ">=4.6"
-toml = "*"
-
-[package.extras]
-testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
-
-[[package]]
-name = "pytest-timeout"
-version = "1.4.2"
-description = "py.test plugin to abort hanging tests"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-pytest = ">=3.6.0"
-
-[[package]]
-name = "pywin32-ctypes"
-version = "0.2.0"
-description = ""
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "readme-renderer"
-version = "29.0"
-description = "readme_renderer is a library for rendering \"readme\" descriptions for Warehouse"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-bleach = ">=2.1.0"
-docutils = ">=0.13.1"
-Pygments = ">=2.5.1"
-six = "*"
-
-[package.extras]
-md = ["cmarkgfm (>=0.5.0,<0.6.0)"]
-
-[[package]]
-name = "regex"
-version = "2021.9.24"
-description = "Alternative regular expression module, to replace re."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "requests"
-version = "2.26.0"
-description = "Python HTTP for Humans."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
-
-[package.dependencies]
-certifi = ">=2017.4.17"
-charset-normalizer = {version = ">=2.0.0,<2.1.0", markers = "python_version >= \"3\""}
-idna = {version = ">=2.5,<4", markers = "python_version >= \"3\""}
-urllib3 = ">=1.21.1,<1.27"
-
-[package.extras]
-socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
-use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
-
-[[package]]
-name = "requests-toolbelt"
-version = "0.9.1"
-description = "A utility belt for advanced users of python-requests"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-requests = ">=2.0.1,<3.0.0"
-
-[[package]]
-name = "rfc3986"
-version = "1.5.0"
-description = "Validating URI References per RFC 3986"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.extras]
-idna2008 = ["idna"]
-
-[[package]]
-name = "secretstorage"
-version = "3.3.1"
-description = "Python bindings to FreeDesktop.org Secret Service API"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-cryptography = ">=2.0"
-jeepney = ">=0.6"
-
-[[package]]
-name = "shiboken6"
-version = "6.1.3"
-description = "Python / C++ bindings helper module"
-category = "dev"
-optional = false
-python-versions = ">=3.6, <3.10"
-
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+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
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+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
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+    {file = "tomli-1.2.2.tar.gz", hash = "sha256:c6ce0015eb38820eaf32b5db832dbc26deb3dd427bd5f6556cf0acac2c214fee"},
+]
+tqdm = [
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+    {file = "tqdm-4.62.3.tar.gz", hash = "sha256:d359de7217506c9851b7869f3708d8ee53ed70a1b8edbba4dbcb47442592920d"},
+]
+twine = [
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+    {file = "twine-3.4.2.tar.gz", hash = "sha256:4caec0f1ed78dc4c9b83ad537e453d03ce485725f2aea57f1bb3fdde78dae936"},
+]
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+    {file = "typed_ast-1.4.3-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:7538e495704e2ccda9b234b82423a4038f324f3a10c43bc088a1636180f11a41"},
+    {file = "typed_ast-1.4.3-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:af3d4a73793725138d6b334d9d247ce7e5f084d96284ed23f22ee626a7b88e39"},
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+    {file = "typed_ast-1.4.3-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:f328adcfebed9f11301eaedfa48e15bdece9b519fb27e6a8c01aa52a17ec31b3"},
+    {file = "typed_ast-1.4.3-cp39-cp39-manylinux1_i686.whl", hash = "sha256:2c726c276d09fc5c414693a2de063f521052d9ea7c240ce553316f70656c84d4"},
+    {file = "typed_ast-1.4.3-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:cae53c389825d3b46fb37538441f75d6aecc4174f615d048321b716df2757fb0"},
+    {file = "typed_ast-1.4.3-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:b9574c6f03f685070d859e75c7f9eeca02d6933273b5e69572e5ff9d5e3931c3"},
+    {file = "typed_ast-1.4.3-cp39-cp39-win32.whl", hash = "sha256:209596a4ec71d990d71d5e0d312ac935d86930e6eecff6ccc7007fe54d703808"},
+    {file = "typed_ast-1.4.3-cp39-cp39-win_amd64.whl", hash = "sha256:9c6d1a54552b5330bc657b7ef0eae25d00ba7ffe85d9ea8ae6540d2197a3788c"},
+    {file = "typed_ast-1.4.3.tar.gz", hash = "sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65"},
+]
+typing-extensions = [
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+    {file = "typing_extensions-3.10.0.2-py3-none-any.whl", hash = "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"},
+    {file = "typing_extensions-3.10.0.2.tar.gz", hash = "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e"},
+]
+urllib3 = [
+    {file = "urllib3-1.26.7-py2.py3-none-any.whl", hash = "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"},
+    {file = "urllib3-1.26.7.tar.gz", hash = "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece"},
+]
+virtualenv = [
+    {file = "virtualenv-20.9.0-py2.py3-none-any.whl", hash = "sha256:1d145deec2da86b29026be49c775cc5a9aab434f85f7efef98307fb3965165de"},
+    {file = "virtualenv-20.9.0.tar.gz", hash = "sha256:bb55ace18de14593947354e5e6cd1be75fb32c3329651da62e92bf5d0aab7213"},
+]
+webencodings = [
+    {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
+    {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},
+]
+zipp = [
+    {file = "zipp-3.6.0-py3-none-any.whl", hash = "sha256:9fe5ea21568a0a70e50f273397638d39b03353731e6cbbb3fd8502a33fec40bc"},
+    {file = "zipp-3.6.0.tar.gz", hash = "sha256:71c644c5369f4a6e07636f0aa966270449561fcea2e3d6747b8d23efaa9d7832"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 8723108..05653ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ flake8 = "*"
 flake8-black = "*"
 flake8-import-order = "*"
 flake8-print = "*"
+pre-commit = { version = "*", python = ">=3.6.1"}
 pytest = "*"
 pytest-cov = "*"
 pytest-timeout = "*"


Test patch:
diff --git a/tests/conftest.py b/tests/conftest.py
index 833b0f7..d2d1d59 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,9 @@
+import gc
+
 import pytest
 
 from observ import scheduler
+from observ.observables import proxy_db
 
 
 def noop():
@@ -23,3 +26,16 @@ def clear():
         yield
     finally:
         scheduler.clear()
+
+
+@pytest.fixture(autouse=True)
+def clear_proxy_db():
+    # Would be nice to do this at the end of runs, but
+    # it seems that pytest keeps some references to some objects
+    # so we're not able to guarentee that the db can be
+    # cleared properly afterwards.
+    gc.collect()
+    # Running gc at the beginning should clear the proxy_db,
+    # but this apparently only works when tests are not failing,
+    # so the db needs to be cleared like this.
+    proxy_db.db = {}
diff --git a/tests/test_collections.py b/tests/test_collections.py
index 8bcc38e..6e7b447 100644
--- a/tests/test_collections.py
+++ b/tests/test_collections.py
@@ -1,22 +1,25 @@
 from unittest.mock import Mock
 
 from observ.dep import Dep
-from observ.observables import ObservableDict, ObservableList, ObservableSet
+from observ.observables import dict_traps, list_traps, set_traps
+from observ.observables import DictProxy, ListProxy, SetProxy
+from observ.observables import proxy_db
 
 
 COLLECTIONS = {
-    ObservableList,
-    ObservableSet,
-    ObservableDict,
+    ListProxy: list_traps,
+    SetProxy: set_traps,
+    DictProxy: dict_traps,
 }
 
 WRAPATTRS = {
-    "_READERS",
-    "_KEYREADERS",
-    "_WRITERS",
-    "_KEYWRITERS",
-    "_DELETERS",
-    "_KEYDELETERS",
+    "READERS",
+    "KEYREADERS",
+    "ITERATORS",
+    "WRITERS",
+    "KEYWRITERS",
+    "DELETERS",
+    "KEYDELETERS",
 }
 
 # we don't wrap these
@@ -41,7 +44,9 @@
     "__hash__",
     "_orphaned_keydeps",
     "__class_getitem__",
-} | WRAPATTRS
+    # __del__ is custom method on Proxy
+    "__del__",
+}
 
 
 def test_wrapping_complete():
@@ -49,13 +54,13 @@ def test_wrapping_complete():
         # ensure we're not wrapping anything more than once
         wrap_list = []
         for attr in WRAPATTRS:
-            wrap_list += list(getattr(coll, attr, set()))
+            wrap_list += list(COLLECTIONS[coll].get(attr, set()))
         assert len(wrap_list) == len(set(wrap_list))
 
         # ensure we're wrapping everything
         to_wrap = set(dir(coll)) - EXCLUDED
         wrapped = set(wrap_list)
-        assert to_wrap == wrapped
+        assert to_wrap == wrapped, f"Failing for: {coll}"
 
 
 def test_list_notify():
@@ -76,10 +81,10 @@ def test_list_notify():
         "__iadd__": ([5],),
         "__imul__": (5,),
     }
-    for name in ObservableList._WRITERS:
-        coll = ObservableList([2])
+    for name in COLLECTIONS[ListProxy]["WRITERS"]:
+        coll = ListProxy([2])
         mock = Mock()
-        coll.__dep__.notify = mock
+        proxy_db.attrs(coll)["dep"].notify = mock
         getattr(coll, name)(*args[name])
         mock.assert_called_once()
 
@@ -108,12 +113,12 @@ def test_list_depend():
         "__reversed__": (),
         "__sizeof__": (),
     }
-    for name in ObservableList._READERS:
-        Dep.stack.append(None)
+    for name in COLLECTIONS[ListProxy]["READERS"]:
+        Dep.stack.append(Mock())
         try:
-            coll = ObservableList([2])
+            coll = ListProxy([2])
             mock = Mock()
-            coll.__dep__.depend = mock
+            proxy_db.attrs(coll)["dep"].depend = mock
             getattr(coll, name)(*args[name])
             mock.assert_called()
         finally:
@@ -132,10 +137,10 @@ def test_set_notify():
         "symmetric_difference_update": ({3},),
         "update": ({3},),
     }
-    for name in ObservableSet._WRITERS:
-        coll = ObservableSet({2})
+    for name in COLLECTIONS[SetProxy]["WRITERS"]:
+        coll = SetProxy({2})
         mock = Mock()
-        coll.__dep__.notify = mock
+        proxy_db.attrs(coll)["dep"].notify = mock
         getattr(coll, name)(*args[name])
         mock.assert_called_once()
 
@@ -176,12 +181,12 @@ def test_set_depend():
         "__sub__": ({3},),
         "__xor__": ({3},),
     }
-    for name in ObservableSet._READERS:
-        Dep.stack.append(None)
+    for name in COLLECTIONS[SetProxy]["READERS"]:
+        Dep.stack.append(Mock())
         try:
-            coll = ObservableSet({2})
+            coll = SetProxy({2})
             mock = Mock()
-            coll.__dep__.depend = mock
+            proxy_db.attrs(coll)["dep"].depend = mock
             getattr(coll, name)(*args[name])
             mock.assert_called()
         finally:
@@ -193,15 +198,15 @@ def test_dict_notify():
         "update": ({5: 6},),
         "__ior__": ({5: 6},),
     }
-    for name in ObservableDict._WRITERS:
-        coll = ObservableDict({2: 3})
-        coll.__dep__.notify = Mock()
-        for key in coll.__keydeps__.keys():
-            coll.__keydeps__[key].notify = Mock()
+    for name in COLLECTIONS[DictProxy]["WRITERS"]:
+        coll = DictProxy({2: 3})
+        proxy_db.attrs(coll)["dep"].notify = Mock()
+        for key in proxy_db.attrs(coll)["keydep"].keys():
+            proxy_db.attrs(coll)["keydep"][key].notify = Mock()
         getattr(coll, name)(*args[name])
-        coll.__dep__.notify.assert_called_once()
-        for key in coll.__keydeps__.keys():
-            coll.__keydeps__[key].notify.assert_not_called()
+        proxy_db.attrs(coll)["dep"].notify.assert_called_once()
+        for key in proxy_db.attrs(coll)["keydep"].keys():
+            proxy_db.attrs(coll)["keydep"][key].notify.assert_not_called()
 
 
 def test_dict_keynotify():
@@ -209,19 +214,19 @@ def test_dict_keynotify():
         "setdefault": (3, 5),
         "__setitem__": (2, 4),
     }
-    for name in ObservableDict._KEYWRITERS:
-        coll = ObservableDict({2: 3})
+    for name in COLLECTIONS[DictProxy]["KEYWRITERS"]:
+        coll = DictProxy({2: 3})
         key = args[name][0]
-        is_new_key = key not in coll.__keydeps__
-        coll.__dep__.notify = Mock()
-        for k in coll.__keydeps__.keys():
-            coll.__keydeps__[k].notify = Mock()
+        is_new_key = key not in proxy_db.attrs(coll)["keydep"]
+        proxy_db.attrs(coll)["dep"].notify = Mock()
+        for k in proxy_db.attrs(coll)["keydep"].keys():
+            proxy_db.attrs(coll)["keydep"][k].notify = Mock()
         getattr(coll, name)(*args[name])
-        coll.__dep__.notify.assert_called_once()
+        proxy_db.attrs(coll)["dep"].notify.assert_called_once()
         if is_new_key:
-            assert isinstance(coll.__keydeps__[key], Dep)
+            assert isinstance(proxy_db.attrs(coll)["keydep"][key], Dep)
         else:
-            coll.__keydeps__[key].notify.assert_called_once()
+            proxy_db.attrs(coll)["keydep"][key].notify.assert_called_once()
 
 
 def test_dict_depend():
@@ -247,15 +252,15 @@ def test_dict_depend():
         "__or__": ({},),
         "__ior__": ({},),
     }
-    for name in ObservableDict._READERS:
-        Dep.stack.append(None)
+    for name in COLLECTIONS[DictProxy]["READERS"]:
+        Dep.stack.append(Mock())
         try:
-            coll = ObservableDict({2: 3})
-            coll.__dep__.depend = Mock()
-            for k in coll.__keydeps__.keys():
-                coll.__keydeps__[k].depend = Mock()
+            coll = DictProxy({2: 3})
+            proxy_db.attrs(coll)["dep"].depend = Mock()
+            for k in proxy_db.attrs(coll)["keydep"].keys():
+                proxy_db.attrs(coll)["keydep"][k].depend = Mock()
             getattr(coll, name)(*args[name])
-            coll.__dep__.depend.assert_called()
+            proxy_db.attrs(coll)["dep"].depend.assert_called()
         finally:
             Dep.stack.pop()
 
@@ -266,16 +271,16 @@ def test_dict_keydepend():
         "__contains__": (2,),
         "__getitem__": (2,),
     }
-    for name in ObservableDict._KEYREADERS:
+    for name in COLLECTIONS[DictProxy]["KEYREADERS"]:
         Dep.stack.append(None)
         try:
-            coll = ObservableDict({2: 3})
-            coll.__dep__.depend = Mock()
-            for k in coll.__keydeps__.keys():
-                coll.__keydeps__[k].depend = Mock()
+            coll = DictProxy({2: 3})
+            proxy_db.attrs(coll)["dep"].depend = Mock()
+            for k in proxy_db.attrs(coll)["keydep"].keys():
+                proxy_db.attrs(coll)["keydep"][k].depend = Mock()
             getattr(coll, name)(*args[name])
-            coll.__dep__.depend.assert_not_called()
-            coll.__keydeps__[args[name][0]].depend.assert_called_once()
+            proxy_db.attrs(coll)["dep"].depend.assert_not_called()
+            proxy_db.attrs(coll)["keydep"][args[name][0]].depend.assert_called_once()
         finally:
             Dep.stack.pop()
 
@@ -285,14 +290,14 @@ def test_dict_delete_notify():
         "clear": (),
         "popitem": (),
     }
-    for name in ObservableDict._DELETERS:
-        coll = ObservableDict({2: 3})
-        coll.__dep__.notify = Mock()
-        for key in coll.__keydeps__.keys():
-            coll.__keydeps__[key].notify = Mock()
+    for name in COLLECTIONS[DictProxy]["DELETERS"]:
+        coll = DictProxy({2: 3})
+        proxy_db.attrs(coll)["dep"].notify = Mock()
+        for key in proxy_db.attrs(coll)["keydep"].keys():
+            proxy_db.attrs(coll)["keydep"][key].notify = Mock()
         getattr(coll, name)(*args[name])
-        coll.__dep__.notify.assert_called_once()
-        assert len(coll.__keydeps__) == 0
+        proxy_db.attrs(coll)["dep"].notify.assert_called_once()
+        assert len(proxy_db.attrs(coll)["keydep"]) == 0
 
 
 def test_dict_delete_keynotify():
@@ -300,15 +305,15 @@ def test_dict_delete_keynotify():
         "pop": (2,),
         "__delitem__": (2,),
     }
-    for name in ObservableDict._KEYDELETERS:
-        coll = ObservableDict({2: 3})
+    for name in COLLECTIONS[DictProxy]["KEYDELETERS"]:
+        coll = DictProxy({2: 3})
         key = args[name][0]
-        coll.__dep__.notify = Mock()
+        proxy_db.attrs(coll)["dep"].notify = Mock()
         keymock = Mock()
-        coll.__keydeps__[key] = keymock
-        for k in coll.__keydeps__.keys():
-            coll.__keydeps__[k].notify = Mock()
+        proxy_db.attrs(coll)["keydep"][key] = keymock
+        for k in proxy_db.attrs(coll)["keydep"].keys():
+            proxy_db.attrs(coll)["keydep"][k].notify = Mock()
         getattr(coll, name)(*args[name])
-        coll.__dep__.notify.assert_called_once()
+        proxy_db.attrs(coll)["dep"].notify.assert_called_once()
         keymock.notify.assert_called_once()
-        assert len(coll.__keydeps__) == 0
+        assert len(proxy_db.attrs(coll)["keydep"]) == 0
diff --git a/tests/test_deps.py b/tests/test_deps.py
index 12dbd88..7929762 100644
--- a/tests/test_deps.py
+++ b/tests/test_deps.py
@@ -1,10 +1,12 @@
-from observ import computed, observe
+from observ import computed, reactive
+from observ.observables import proxy_db
 
 
 def test_deps_copy():
-    # this test proves that even tho we have redundant deps
-    # we don't redundantly recompute
-    state = observe({"foo": 5, "bar": 6})
+    # this test proves that even though we have
+    # redundant deps we don't redundantly recompute
+    # FIXME: I don't think this test works as intended anymore
+    state = reactive({"foo": 5, "bar": 6})
     call_count = 0
 
     @computed
@@ -15,28 +17,30 @@ def prop():
 
     assert prop() == {"foo": 5, "bar": 6}
     assert prop() is not state
-    assert len(prop.__watcher__._deps) == 3
+    # FIXME: the _deps length was 3
+    assert len(prop.__watcher__._deps) == 1
     assert call_count == 1
 
     state["foo"] = 3
     assert prop() == {"foo": 3, "bar": 6}
     assert prop() is not state
-    assert len(prop.__watcher__._deps) == 3
+    # FIXME: the _deps length was 3
+    assert len(prop.__watcher__._deps) == 1
     assert call_count == 2
 
 
 def test_deps_delete():
     # test that dep objects are removed on delete
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
 
     state["baz"] = 5
-    assert len(state.__keydeps__) == 3
+    assert len(proxy_db.attrs(state)["keydep"]) == 3
 
     del state["baz"]
-    assert len(state.__keydeps__) == 2
+    assert len(proxy_db.attrs(state)["keydep"]) == 2
 
     state.popitem()
-    assert len(state.__keydeps__) == 1
+    assert len(proxy_db.attrs(state)["keydep"]) == 1
 
     state.clear()
-    assert len(state.__keydeps__) == 0
+    assert len(proxy_db.attrs(state)["keydep"]) == 0
diff --git a/tests/test_observe.py b/tests/test_observe.py
index bcf7bcd..66f2f2b 100644
--- a/tests/test_observe.py
+++ b/tests/test_observe.py
@@ -1,10 +1,10 @@
-from observ import computed, observe
+from observ import computed, reactive
 
 
 def test_observe_new_coll():
     # this test proves that even tho we have redundant deps
     # we don't redundantly recompute
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
 
     @computed
     def prop():
@@ -27,7 +27,7 @@ def prop():
 def test_observe_changed():
     # this test proves that we only fire if a value actually
     # changed
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     call_count = 0
 
     @computed
diff --git a/tests/test_proxy.py b/tests/test_proxy.py
new file mode 100644
index 0000000..27f5977
--- /dev/null
+++ b/tests/test_proxy.py
@@ -0,0 +1,228 @@
+import gc
+
+import pytest
+
+from observ.observables import (
+    DictProxy,
+    ListProxy,
+    Proxy,
+    proxy,
+    proxy_db,
+    ReadonlyDictProxy,
+    ReadonlyError,
+    ReadonlyListProxy,
+    ReadonlySetProxy,
+    SetProxy,
+)
+
+
+def test_proxy_lifecycle():
+    data = {"foo": "bar"}
+    obj_id = id(data)
+
+    # Call proxy to wrap the data object
+    wrapped_data = proxy(data)
+
+    assert isinstance(wrapped_data, Proxy)
+    assert obj_id in proxy_db.db
+    assert wrapped_data.target is data
+
+    # Retrieve the proxy from the proxy_db
+    referenced_proxy = proxy_db.get_proxy(data)
+
+    assert referenced_proxy is wrapped_data
+    assert referenced_proxy.target is wrapped_data.target
+
+    # Destroy the second proxy
+    del referenced_proxy
+
+    assert obj_id in proxy_db.db
+    assert proxy_db.get_proxy(data) is not None
+
+    # Destroy the original proxy
+    del wrapped_data
+
+    assert obj_id in proxy_db.db
+    assert proxy_db.get_proxy(data) is None
+
+    # Also delete the original data and run garbage collection
+    del data
+    gc.collect()
+
+    assert obj_id not in proxy_db.db
+
+
+def test_proxy_lifecycle_auto():
+    # Call proxy to wrap the data object
+    wrapped_data = proxy({"foo": "bar"})
+    obj_id = id(wrapped_data.target)
+
+    assert isinstance(wrapped_data, Proxy)
+    assert obj_id in proxy_db.db
+    # assert wrapped_data.target is data
+
+    # Retrieve the proxy from the proxy_db
+    referenced_proxy = proxy_db.get_proxy(wrapped_data.target)
+
+    assert referenced_proxy is wrapped_data
+    assert referenced_proxy.target is wrapped_data.target
+
+    # Destroy the second proxy
+    del referenced_proxy
+
+    assert obj_id in proxy_db.db
+    assert proxy_db.get_proxy(wrapped_data.target) is not None
+
+    # Destroy the original proxy
+    del wrapped_data
+
+    assert obj_id not in proxy_db.db
+
+
+def test_multiple_proxy_calls():
+    data = {"foo": "bar"}
+
+    first_proxy = proxy(data)
+    second_proxy = proxy(data)
+    third_proxy = proxy(second_proxy)
+
+    assert first_proxy is second_proxy
+    assert second_proxy is third_proxy
+
+
+def test_list_proxy():
+    data = [1, 2, 3]
+    proxied = proxy(data)
+    assert isinstance(proxied, ListProxy)
+    assert proxied[0] == 1
+    assert len(proxied) == 3
+    assert 1 in proxied
+
+
+def test_list_proxy_deep():
+    data = [1, {"foo": "bar"}]
+    proxied = proxy(data)
+    assert isinstance(proxied[1], DictProxy)
+
+
+def test_set_proxy():
+    data = {1, 2, 3}
+    proxied = proxy(data)
+    assert isinstance(proxied, SetProxy)
+    assert len(proxied) == 3
+    assert 1 in proxied
+
+
+def test_dict_proxy():
+    data = {"foo": "bar"}
+
+    proxied = proxy(data)
+    assert isinstance(proxied, DictProxy)
+    assert proxied["foo"] == "bar"
+
+    proxied["foo"] = "baz"
+
+    assert proxied["foo"] == "baz"
+
+    proxied["lorem"] = "ipsum"
+
+    assert proxied["lorem"] == "ipsum"
+
+    del proxied["lorem"]
+    assert "lorem" not in proxied
+    assert len(proxied) == 1
+
+
+def test_readonly_dict_proxy():
+    data = {"foo": "bar"}
+    readonly_proxy = proxy(data, readonly=True)
+
+    assert isinstance(readonly_proxy, ReadonlyDictProxy)
+
+    with pytest.raises(ReadonlyError):
+        readonly_proxy["foo"] = "baz"
+
+
+def test_readonly_nested_dict_proxy():
+    proxied = proxy({"foo": "bar"})
+    readonly_proxy = proxy(proxied, readonly=True)
+    another_proxied = proxy(readonly_proxy, readonly=False)
+
+    assert isinstance(proxied, DictProxy)
+    assert isinstance(readonly_proxy, ReadonlyDictProxy)
+
+    with pytest.raises(ReadonlyError):
+        readonly_proxy["foo"] = "baz"
+
+    another_proxied["foo"] = "baz"
+
+
+def test_readonly_list_proxy():
+    readonly_proxy = proxy(["foo", "bar"], readonly=True)
+
+    assert isinstance(readonly_proxy, ReadonlyListProxy)
+
+    with pytest.raises(ReadonlyError):
+        readonly_proxy[0] = "baz"
+
+
+def test_readonly_set_proxy():
+    readonly_proxy = proxy({"foo", "bar"}, readonly=True)
+
+    assert isinstance(readonly_proxy, ReadonlySetProxy)
+
+    with pytest.raises(ReadonlyError):
+        readonly_proxy.add("baz")
+
+
+def test_nested_dict_proxy():
+    data = {"foo": "bar", "baz": {"lorem": "ipsum"}}
+    proxied = proxy(data)
+    assert isinstance(proxied, DictProxy)
+    assert isinstance(proxied["baz"], DictProxy)
+
+
+def test_tuple():
+    data = ({"foo": "bar"},)
+    proxied = proxy(data)
+    assert isinstance(proxied, tuple)
+    assert isinstance(proxied[0], DictProxy)
+
+
+def test_embedded_tuple():
+    data = {"foo": ({"bar"},)}
+    proxied = proxy(data)
+    assert isinstance(proxied, DictProxy)
+    assert isinstance(proxied["foo"][0], SetProxy)
+
+
+def test_shallow_proxy():
+    shallow_proxy = proxy({"foo": "bar", "baz": {"lorem": "ipsum"}}, shallow=True)
+    assert isinstance(shallow_proxy, DictProxy)
+    assert shallow_proxy.shallow
+
+    deep_proxy = proxy(shallow_proxy)
+    assert not deep_proxy.shallow
+
+
+def test_non_hashable():
+    # Should not be able to create a hash from a proxy
+    with pytest.raises(TypeError):
+        hash(proxy({}))
+
+    # Should not be able to add a proxy to a set
+    with pytest.raises(TypeError):
+        _ = proxy({"set", proxy({})})
+
+    # Should not be able to use a proxy as a key
+    with pytest.raises(TypeError):
+        _ = proxy({proxy({}): "value"})
+
+
+def test_raise_on_existing_proxy():
+    data = {"foo": "bar"}
+
+    _ = Proxy(data)
+
+    with pytest.raises(RuntimeError):
+        _ = Proxy(data)
diff --git a/tests/test_scheduler.py b/tests/test_scheduler.py
index 72715b8..d8b08b8 100644
--- a/tests/test_scheduler.py
+++ b/tests/test_scheduler.py
@@ -1,13 +1,13 @@
 import pytest
 
-from observ import observe, scheduler, watch
+from observ import reactive, scheduler, watch
 
 
 def test_no_flush_handler():
     """
     Test if we get a ValueError when no flush request handler is registered
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls = 0
 
     def cb(old, new):
@@ -24,7 +24,7 @@ def test_flush(noop_request_flush):
     """
     Test if flush works
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls = 0
 
     def cb(old, new):
@@ -51,14 +51,14 @@ def test_cycle_expression(noop_request_flush):
     Test if we can detect an infinite update cycle caused by
     the watch expression
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls = 0
 
     def exp():
-        state["foo"] += 1
         return state["foo"]
 
     def cb(old, new):
+        state["foo"] += 1
         nonlocal calls
         calls += 1
 
@@ -79,7 +79,7 @@ def test_cycle_callback(noop_request_flush):
     Test if we can detect an infinite update cycle caused
     by a callback
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls = 0
 
     def exp():
@@ -107,7 +107,7 @@ def test_queue_growth(noop_request_flush):
     Test if a flush also handles watchers that are triggered
     during the flush
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls_1 = 0
     calls_2 = 0
 
@@ -143,7 +143,7 @@ def test_queue_cycle_indirect(noop_request_flush):
     Test if we can detect an infinite update cycle between
     _multiple_ watchers' callbacks
     """
-    state = observe({"foo": 5, "bar": 6})
+    state = reactive({"foo": 5, "bar": 6})
     calls_1 = 0
     calls_2 = 0
 
diff --git a/tests/test_usage.py b/tests/test_usage.py
index cb888c5..a7848ed 100644
--- a/tests/test_usage.py
+++ b/tests/test_usage.py
@@ -1,11 +1,83 @@
 import pytest
 
-from observ import computed, observe, watch
+from observ import computed, reactive, to_raw, watch
+from observ.observables import Proxy, StateModifiedError
 from observ.watcher import WrongNumberOfArgumentsError
 
 
-def test_usage():
-    a = observe({"foo": 5, "bar": [6, 7, 8], "quux": 10, "quuz": {"a": 1, "b": 2}})
+def test_usage_dict():
+    a = reactive({"foo": "bar"})
+    called = 0
+    values = ()
+
+    def _callback(new, old):
+        nonlocal called
+        nonlocal values
+        called += 1
+        values = (new, old)
+
+    watcher = watch(lambda: a["foo"], _callback, sync=True)
+
+    assert not watcher.dirty
+    assert called == 0
+    a["foo"] = "baz"
+    assert called == 1
+    assert values[0] == "baz"
+    assert values[1] == "bar"
+
+
+def test_usage_dict_new_key():
+    a = reactive({"foo": "bar"})
+    called = 0
+
+    def _callback(new, old):
+        nonlocal called
+        called += 1
+
+    watcher = watch(lambda: len(a), _callback, sync=True)
+
+    assert not watcher.dirty
+    assert called == 0
+    a["quuz"] = "quur"
+    assert called == 1
+    assert len(a) == 2
+    assert a["quuz"] == "quur"
+
+
+def test_usage_list():
+    a = reactive([1, 2])
+    called = 0
+
+    def _callback():
+        nonlocal called
+        called += 1
+
+    watcher = watch(lambda: len(a), _callback, sync=True)
+    assert not watcher.dirty
+    assert called == 0
+    a.append(3)
+    assert called == 1
+    assert len(a) == 3
+
+
+def test_usage_set():
+    a = reactive({1, 2})
+    called = 0
+
+    def _callback():
+        nonlocal called
+        called += 1
+
+    watcher = watch(lambda: len(a), _callback, sync=True)
+    assert not watcher.dirty
+    assert called == 0
+    a.add(3)
+    assert called == 1
+    assert len(a) == 3
+
+
+def test_usage_computed():
+    a = reactive({"foo": 5, "bar": [6, 7, 8], "quux": 10, "quuz": {"a": 1, "b": 2}})
     execute_count = 0
 
     def bla():
@@ -47,7 +119,7 @@ def bla2():
 
     called = 0
 
-    def _callback(old_value, new_value):
+    def _callback():
         nonlocal called
         called += 1
 
@@ -70,7 +142,7 @@ def _callback(old_value, new_value):
 
 
 def test_watch_immediate():
-    a = observe({"foo": 5, "bar": [6, 7, 8], "quux": 10, "quuz": {"a": 1, "b": 2}})
+    a = reactive({"foo": 5, "bar": [6, 7, 8], "quux": 10, "quuz": {"a": 1, "b": 2}})
 
     called = 0
 
@@ -89,17 +161,17 @@ def _callback(old_value, new_value):
 
 
 def test_usage_deep_vs_non_deep():
-    a = observe({"foo": [0, 1]})
+    a = reactive({"foo": [0, 1]})
 
     non_deep_called = 0
 
-    def _non_deep_callback(old_value, new_value):
+    def _non_deep_callback(new):
         nonlocal non_deep_called
         non_deep_called += 1
 
     deep_called = 0
 
-    def _deep_callback(old_value, new_value):
+    def _deep_callback():
         nonlocal deep_called
         deep_called += 1
 
@@ -114,7 +186,7 @@ def _deep_callback(old_value, new_value):
 
 
 def test_callback_signatures():
-    a = observe({"foo": 0})
+    a = reactive({"foo": 0})
     called = 0
 
     def empty_callback():
@@ -131,14 +203,14 @@ def simple_callback(value):
     watcher = watch(lambda: a["foo"], simple_callback, sync=True, immediate=True)
     assert called == 2
 
-    def full_callback(old, new):
+    def full_callback(new, old):
         nonlocal called
         called += 1
 
     watcher = watch(lambda: a["foo"], full_callback, sync=True, immediate=True)
     assert called == 3
 
-    def too_complex_callback(old, new, other):
+    def too_complex_callback(new, old, other):
         nonlocal called
         called += 1
 
@@ -164,3 +236,215 @@ def method_raises_type_error(*args):
         )
     assert called == 4
     assert not isinstance(e, WrongNumberOfArgumentsError)
+
+
+def test_dict_keys():
+    state = reactive({"foo": {"bar": 5}})
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        i = 0
+        for key in state:
+            i += 1
+        return i
+
+    _ = watch(_expr, _called, sync=True, immediate=True, deep=True)
+
+    assert len(calls) == 1
+
+    state["baz"] = 1
+    assert len(calls) == 2
+
+
+def test_dict_values():
+    state = reactive({"foo": {"bar": 5}})
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        for value in state.values():
+            if value:
+                return value
+
+    _ = watch(_expr, _called, sync=True, immediate=True, deep=True)
+
+    assert len(calls) == 1
+
+    state["foo"]["bar"] += 1
+    assert len(calls) == 2
+
+
+def test_dict_items():
+    state = reactive({"foo": {"bar": 5}})
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        for key, value in state.items():
+            if key == "foo":
+                return value
+
+    _ = watch(_expr, _called, sync=True, immediate=True, deep=True)
+
+    assert len(calls) == 1
+
+    state["foo"]["bar"] += 1
+    assert len(calls) == 2
+
+
+def test_list_iter():
+    state = reactive([{"b": 5}])
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        for x in state:
+            return x["b"]
+
+    _ = watch(_expr, _called, sync=True, immediate=True, deep=True)
+
+    assert len(calls) == 1
+
+    state[0]["b"] = 6
+    assert len(calls) == 2
+
+
+def test_list_reversed():
+    state = reactive([{"b": 5}])
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        for x in reversed(state):
+            return x["b"]
+
+    _ = watch(_expr, _called, sync=True, immediate=True, deep=True)
+
+    assert len(calls) == 1
+
+    state[0]["b"] = 6
+    assert len(calls) == 2
+
+
+def test_isinstance():
+    state = reactive(["a", {"b": 5}])
+
+    calls = []
+
+    def _called(new):
+        nonlocal calls
+        calls.append(new)
+
+    def _expr():
+        if isinstance(state[1], Proxy):
+            return state[1]
+
+    watcher = watch(_expr, _called, sync=True, immediate=True)
+
+    assert len(calls) == 1
+    assert isinstance(watcher.value, Proxy), type(watcher.value)
+
+
+def test_reactive_in_reactive():
+    state = reactive({"foo": 5})
+    state["bar"] = reactive(["something", "else"])
+
+    assert state["bar"][0] == "something"
+
+
+def test_to_raw():
+    state = reactive({"dict": {"key": 5}})
+    state["list"] = reactive(["list", "item"])
+    state["list"].append(reactive({"set"}))
+    state["tuple"] = (reactive({"set", "bloeb"}), reactive({"dict": "value"}))
+
+    raw = to_raw(state)
+
+    assert isinstance(raw, dict)
+    assert isinstance(raw["dict"], dict)
+    assert isinstance(raw["dict"]["key"], int), type(raw["dict"]["key"])
+    assert isinstance(raw["list"], list), type(raw["list"])
+    assert isinstance(raw["list"][-1], set), type(raw["list"][-1])
+    assert isinstance(raw["tuple"], tuple), type(raw["tuple"])
+    assert isinstance(raw["tuple"][0], set), type(raw["tuple"][0])
+    assert isinstance(raw["tuple"][1], dict), type(raw["tuple"][1])
+
+
+def test_computed():
+    a = reactive({"foo": 5})
+
+    def _readonly_expr():
+        return a["foo"] * 2
+
+    computed_expr = computed(_readonly_expr)
+    assert computed_expr() == 10
+
+    def _expr_with_write():
+        # Writing to the state during a computed
+        # expression should raise a StateModifiedError
+        # Trigger a key writer
+        a["bar"] = a["foo"] * 2
+        return a["foo"] * 2
+
+    computed_expr = computed(_expr_with_write)
+    with pytest.raises(StateModifiedError):
+        _ = computed_expr()
+
+
+def test_watch_computed():
+    a = reactive([0])
+    from observ.observables import ListProxy
+
+    assert isinstance(a, ListProxy)
+
+    @computed
+    def _times_ten():
+        # This next line should trigger the StateModifiedError
+        # when the watcher is evaluated
+        # Trigger a writer trap
+        a.append(0)
+        return a[0] * 10
+
+    with pytest.raises(StateModifiedError):
+        _ = watch(_times_ten, None, sync=True)
+
+    a = reactive({"foo": "bar"})
+
+    @computed
+    def _comp_fail():
+        # Trigger a key deleter trap
+        a.pop()
+        return a[0]
+
+    with pytest.raises(StateModifiedError):
+        _ = watch(_comp_fail, None, sync=True)
+
+    @computed
+    def _comp_fail():
+        # Trigger a deleter trap
+        a.clear()
+        return a[0]
+
+    with pytest.raises(StateModifiedError):
+        _ = watch(_comp_fail, None, sync=True)