Better error message when encountering "special" types

oxan / djangorestframework-dataclasses

Dataclasses serializer for Django REST framework

BSD 3-Clause "New" or "Revised" License

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Closed intgr closed 4 years ago

intgr commented 4 years ago

_SpecialForm types like Literal, NoReturn don't have an __mro__ attribute.

Previously, using them in a dataclass caused AttributeError.

Also added a unit test for regular unsupported types.