[3.6] bpo-28556: Update to typing: treat subscripted generics as proxies (#265) by Mariatta · Pull Request #268 · python/cpython

Pickled code objects now contain importlib.util.MAGIC_NUMBER. Unpickling
code objects pickled with an incompatible version of Python now raises a
ValueError exception.

Unpickling code objects pickled with an incompatible version of Python
now creates a RuntimeWarning. The resulting code object starts with an
invalid opcode and renders unpickled frames invalid. Unpickling a
function whose code is invalid causes a RuntimeWarning too.

Enable unpickling code objects pickled by previous Stackless versions.

Update the documentation.

Pickled code objects now contain importlib.util.MAGIC_NUMBER.
Unpickling code objects pickled with an incompatible version of Python
now creates a RuntimeWarning. The resulting code object starts with an
invalid opcode and renders unpickled frames invalid. Unpickling a
function whose code is invalid causes a RuntimeWarning too.

Fix a ref leak in an error handling code path introduced by commit
1c04e79.