Guido van Rossum <[email protected]> added the comment:

Since these are new forms (list[int] previously was an error), does it actually 
matter? Especially since these are primarily used in annotations.

@Joseph Perez, is there a specific library or pattern that is broken by this?

FWIW I did think rather carefully about which attributes to delegate or not, 
and delegating __class__ was intentional.

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<https://bugs.python.org/issue44293>
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