[issue32929] Change dataclasses hashing to use unsafe_hash boolean (default to False)

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

@steven.daprano the name was +1'ed by many people in the python-dev discussion as sending the right message. So I'm reluctant to change it. If you can cause a landslide of support for `_hash` there we can change it in b3.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32929>
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