Inconsistent dataclass order behavior on Python 3.13+

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

Linked PRs

• gh-137497

まず、Python 3.13+ で issue にある dataclasses の順序比較を再現し、次に関連する issue #128294 と #120645、および PR #137497 の提案された修正を読みます。生成された順序比較が NaN 値に対して等価性と一貫した動作をし、報告された assertions に対するリグレッションカバレッジがあれば完了です。