bpo-35540 dataclasses.asdict support defaultdict fields by kwsp · Pull Request #32056 · python/cpython

dataclasses.asdict breaks when there are `defaultdict`s in the dataclass
attributes because it assumes `defaultdict` and `dict` are the same thing,
but in reality `defaultdict` takes a default_factory as the first argument
in its constructor. This change adds support for defaultdict fields.

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