Makes `Unset` to be repr as Unset in docs and doctests.
Removes deprecation warnings from our tests.
Fixes a doctest that used a removed module.
Fixes `pow_` type-checks and errors.
Fixes a doctest for `full_nameof`.
Fixes deprecation version of first, and get_first.
Geralizes _UnsetType's representation.
Refactors _UnsetType hierarchy and introduces the `ignored` object.
Deprecated (and ignores) `return_tuple` argument in `first_n`. Now it returns a generator object.
Removes unused imports
Creates module to mark development status
Adds a lazily evaluation scheme for `setdefaultattr`.