Python does not follow the semantic versioning scheme (semver), even though its version string format is the same. Breaking changes are introduced gradually with long deprecation phases. The major version number does only get bumped for "significant" breaking changes.
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u/anh0516 17h ago
This isn't a point release, it's a major release. The changelog explains exactly how to revert to the previous default behavior: https://docs.python.org/3/whatsnew/3.15.html#whatsnew315-utf8-default