Inconsistent dataclass order behavior on Python 3.13+ #137658
Description
Bug report
Bug description:
Semantics of dataclasses __eq__ have changed in Python 3.13+, the semantic is now inconsistent with the order=True generated set of dunder methods on the same Python 3.13+ versions.
Related issues:
#128294
#120645
@dataclasses.dataclass(order=True)
class Data:
a: float
nan = float("nan")
assert not (Data(nan) < Data(nan))
# assert not (Data(nan) <= Data(nan)), "fails on 3.13 even though {<, ==} are both False"
assert not (Data(nan) > Data(nan))
# assert not (Data(nan) >= Data(nan)), "fails on 3.13 even though {>, ==} are both False"
assert (Data(nan) != Data(nan))
assert not (Data(nan) == Data(nan))Proposed fix PR: #137497
CPython versions tested on:
3.13
Operating systems tested on:
Windows