Remove unused continuation
Some trivial stubs.
Remove unnecessarry immutability annotations
add some prefab functionality
Rework impersonators/chaperones to remove a lot of manual type checking
Merge branch 'master' of https://github.com/samth/pycket
Merge branch 'master' into structs
Merge branch 'master' into structs
add assert to check type of the prefab's name