[issue35540] dataclasses.asdict breaks with defaultdict fields

[Paul Ganssle]

Change by Paul Ganssle <p.ganssle at gmail.com>:


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pull_requests: +15935
pull_request: https://github.com/python/cpython/pull/16356

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35540>
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