After some playing around, I figured out a pattern that works without any changes to the implementations of `dataclass` or `Enum`, and I like this because it keeps the 2 kinds of concern separate. Maybe I'll try submitting an MR to add an example like this to the documentation for `Enum`.

In [1]: from dataclasses import dataclass

In [2]: from enum import Enum

In [3]: @dataclass(frozen=True)
   ...: class CreatureDataMixin:
   ...:     size: str
   ...:     legs: int
   ...:

In [4]: class Creature(CreatureDataMixin, Enum):
   ...:     BEETLE = ('small', 6)
   ...:     DOG = ('medium', 4)
   ...:

In [5]: Creature.DOG
Out[5]: Creature(size='medium', legs=4)

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