realead <[email protected]> added the comment:
@mark.dickinson
> ...my expectation was that there would be few cases of breakage, and that for
> those few cases it shouldn't be difficult to fix the breakage.
This expectation is probably correct.
My issue is somewhat only partly on-topic here: If one wants to have all NaNs
in one equivalency class (e.g. if used as a key-value for example in pandas) it
is almost impossible to do so in a consistent way without taking a performance
hit. It seems to be possible builtin-types (even if frozenset won't be pretty),
but already something like
class A:
def __init__(self, a):
self.a=a
def __hash__(self):
return hash(self.a)
def __eq__(self, other):
return self.a == other.a
is not easy to handle.
A special comparator for containers would be an ultimative solution, but I see
how this could be too much hassle for a corner case.
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<https://bugs.python.org/issue43475>
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