Backport: Fix activation lookup with Python 3.12.3 (#375) #377
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Description
We used the metaclass
EnumMeta
/EnumType
to override reporting of missing enum values (to give the full set of supported activations). However, in Python 3.12.3, the default value of thename
parameter ofEnumType.__call__
method was changed fromNone
to_not_given
:python/cpython@d771729
Even though this is a public API (which now uses a private default value), it seems too risky to continue using it. So in this change, we implement
Enum.__mising__
instead for the improved error reporting.Checklist