Ivan Levkivskyi added the comment:
Guido, Yury, it looks like I solved the puzzle. All the remaining problems are
because of forward references. In particular, _ForwardRef keeps a reference to
the frame where it was defined:
typing_globals = globals()
frame = sys._getframe(1)
while frame is not None and frame.f_globals is typing_globals:
frame = frame.f_back
assert frame is not None
self.__forward_frame__ = frame
This is old code from 2015 introduced to support __isinstance__ for forward
refs. The latter is no more supported anyway, so that I believe this code
should be removed.
I will make a PR upstream soon.
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<http://bugs.python.org/issue28649>
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