Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment: Do data classes let you define some fields as being excluded from the equality/ordering/hashing? I got the impression that if a field existed, it was part of the "key" no matter what, which isn't necessarily correct in the general case. Simple examples would be attributes that equivalent C++ would tag with the mutable keyword; they're not part of the logical state of the instance (e.g. debugging counters or whatever), so they shouldn't be included in the "key".
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