GH-128520: More consistent type-checking behaviour in pathlib #130199
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In the following methods, skip casting of the argument to a path object if the argument has a `with_segments` attribute. In `PurePath`: `relative_to()`, `is_relative_to()`, `match()`, and `full_match()`. In `Path`: `rename()`, `replace()`, `copy()`, `copy_into()`, `move()`, and `move_into()`. Previously the check varied a bit from method to method. The `PurePath` methods used `isinstance(arg, PurePath)`; the `rename()` and `replace()` methods always cast, and the remaining `Path` methods checked for a private `_copy_writer` attribute. We apply identical changes to relevant methods of the private ABCs. This improves performance a bit, because `isinstance()` checks on ABCs are expensive.
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In the following methods, skip casting of the argument to a path object if the argument has a
with_segmentsattribute.PurePath:relative_to(),is_relative_to(),match(), andfull_match().Path:rename(),replace(),copy(),copy_into(),move(), andmove_into().Previously the check varied a bit from method to method. The
PurePathmethods checkedisinstance(arg, PurePath); therename()andreplace()methods always cast, and the remainingPathmethods checked for a privatearg._copy_writerattribute.We apply identical changes to relevant methods of the private ABCs. This improves performance a bit, because
isinstance()checks on ABCs are expensive.