[issue43905] dataclasses.astuple does deepcopy on all fields

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

The reason for the deep copying was to support changing a hierarchy of dataclasses into something that could be JSON serialized. But it didn't really work out. It recurses into dataclasses, namedtuples, lists, tuples, and dicts, and deep copies everything else.

As I said, it's a design flaw.

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<https://bugs.python.org/issue43905>
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