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PEP 585: Explain the choice of GenericAlias over GenericType (#1319) 

Per Nick's explanation on python-dev.
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Guido van Rossum 2020-02-25 15:54:58 -08:00 committed by GitHub
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@ -339,6 +339,14 @@ been useful, however implementing the type checker within Python that
would deal with complex types, nested type checking, type variables,
string forward references, and so on is out of scope for this PEP.
Naming the type ``GenericType`` instead of ``GenericAlias``
-----------------------------------------------------------
We considered a different name for this type, but decided
``GenericAlias`` is better -- these aren't real types, they are
aliases for the corresponding container type with some extra metadata
attached.
Note on the initial draft
=========================