[issue32226] Implement PEP 560: Core support for typing module and generic types

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

> This adds an overhead to every indexing.

I'm not doubting your results, but I'm curious how that happened. The extra
code in PyObject_GetItem is right before the point where it would otherwise
raise TypeError -- I presume you benchmark never reached that point. Could
it be that the compiler ends up rearranging the code in a way that is less
optimal for the instruction cache?

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