Nils Kattenbeck <nilskem...@gmail.com> added the comment:

> The way I fixed this is I added `__forward_module__` to `typing.ForwardRef`, 
> so that it can resolve the forward reference with the same globals as the 
> ones specified by the module in `__forward_module__`. `TypedDict`'s metaclass 
> should then pass the dictionary’s module name to the annotations’ forward 
> references via the added `module`’s keyword argument in 
> `typing._type_check()`. I can work in a pull request with this solution and 
> discuss any potential problems.

While this seems like a good solution I would still like to figure out why 
TypedDict do not preserve MRO. Because for now I have not found a reason nor 
did someone on the typing-sig mailinglist have a clue. Should there (no longer) 
be a reason for this then this problem has a trivial solution (just re-add the 
MRO and use that).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41249>
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