Raymond Hettinger <[email protected]> added the comment:
> I'm loathe to guarantee anything about this in the language itself.
There aren't language any guarantees being proposed. Letting the hash depend
on the object id just helps avoid quadratic behavior. Making float('NaN') a
singleton is also perfectly reasonable behavior for an immutable type. Neither
is a guaranteed behavior, just a convenient one.
> I'm not convinced it addresses a real-world problem
Maybe yes, maybe no. I would hope that NaNs arising from bogus calculations
would be rare. OTOH, they are commonly used for missing values in Pandas where
internal dict/set operations abound. Either way, I would like to close off a
trivially easy way to invoke quadratic behavior unexpectedly.
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<https://bugs.python.org/issue43475>
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