8000 gh-132139: 3.14 what's new: elaborate on why you can no longer set `U… · python/cpython@42e3a84 · GitHub
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gh-132139: 3.14 what's new: elaborate on why you can no longer set Union attributes (#132157)
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‎Doc/whatsnew/3.14.rst

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@@ -1130,8 +1130,9 @@ typing
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For example, ``isinstance(int | str, typing.Union)`` will return ``True``; previously
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this raised :exc:`TypeError`.
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- The ``__args__`` attribute of :class:`typing.Union` objects is no longer writable.
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- It is no longer possible to set arbitrary dunder attributes on :class:`typing.Union`
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objects.
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- It is no longer possible to set any attributes on :class:`typing.Union` objects.
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This only ever worked for dunder attributes on previous versions, was never
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documented to work, and was subtly broken in many cases.
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(Contributed by Jelle Zijlstra in :gh:`105499`.)
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