[issue20632] Define a new __key__ protocol

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

It isn't InitVar that you want for that use case (that's just for passing extra information to __post_init__).

Instead, you want:

    extra_field = field(compare=False): int # Excluded from __hash__, __eq_, etc

You can also exclude a field from __hash__, but keep it in the comparison methods:

    unhashed_field = field(hash=False): int # Excluded from __hash__ only

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<https://bugs.python.org/issue20632>
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