Fix AttributeError when using generic SerializableType subclass #275
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When using PEP 695 syntax to create a generic class, some private attributes are set up by the runtime in
__init_subclass__()
. Those attributes are needed when specializing the generic class.SerializableType did not call
super().__init_subclass__()
and thus those attributes were missing, leading to an AttributeError.Fixes #274