Fix return value annotations for methods returning copies #1880
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These methods always return a new object of the same type as the object they are bound to, even if this is a subclass. Change the annotations to reflect that.
I have not opened an issue, because it's not a functional bug. It just causes issues with static type checkers.
Checklist:
CHANGES.rst
summarizing the change and linking to the issue... versionchanged::
entries in any relevant code docs. (N/A)pre-commit
hooks and fix any issues.pytest
andtox
, no tests failed.