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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"3.14 regression: `Union[int, str] is Union[int, str]` does not hold","articleBody":"# Bug report\n\n### Bug description:\n\n### Python 3.13.2\n\n```pycon\n\u003e\u003e\u003e from typing import Union\n\u003e\u003e\u003e Union[int, str] is Union[int, str]\nTrue\n```\n\n### Python 3.14.0a6\n\n```pycon\n\u003e\u003e\u003e from typing import Union\n\u003e\u003e\u003e Union[int, str] is Union[int, str]\nFalse\n```\n\nIs this change desired, is it documented? This breaks tests in https://github.com/python-attrs/cattrs/blob/d8f17b7e7e57006171027df4d647a6fe068b623e/tests/test_disambiguators.py#L211\n\n```python\nassert fn({\"op\": 0, \"t\": \"MESSAGE_CREATE\"}) is Union[F, G]\n```\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-131941\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/hroncok","@type":"Person","name":"hroncok"},"datePublished":"2025-03-31T10:41:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/131933/cpython/issues/131933"}