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Fri Feb 2 10:56:46 EST 2018 · https://mail.python.org/pipermail/python-dev/2018-February/152064.html

On Friday, February 2, 2018 10:51:11 AM EST Eric V. Smith wrote:
> I was specifically talking about the case of a non-frozen, hashable
> class. If you want to make a class frozen and hashable, then:
> 
> @dataclass(frozen=True)
> 
> will do just that.
> 
> The case you brought up initially is the non-frozen, hashable class.
> It's that case that I think is very rare. I'll ask again: what's your
> use case for wanting a non-frozen, hashable class? I'm genuinely
> interested.

My point is exactly that there is _no_ valid use case, so (hash=True, 
frozen=False) should not be a thing!  Why are you so insistent on adding 
a dangerous option which you admit is nearly useless?

                               Elvis

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[Python-Dev] Dataclasses and correct hashability