BUG: Fixed an issue wherein _GenericAlias.__getitem__
would raise for types with >1 parameters
#19094
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Backport of #19092.
Found and fixed a minor bug wherein
_GenericAlias
could raise under certain circumstances.The issue was that only a single parameter was passed to underlying generic types,
even if aforementioned types would demand more than 1 parameter.
Examples
The behavior prior to this PR: