GH-128520: Subclass abc.ABC in pathlib._abc
#128745
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−51
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Convert `JoinablePath`, `ReadablePath` and `WritablePath` to real ABCs derived from `abc.ABC`. Make `JoinablePath.parser` abstract, rather than defaulting to `posixpath`. Register `PurePath` and `Path` as virtual subclasses of the ABCs rather than deriving. This avoids a hit to path object instantiation performance.
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Convert
JoinablePath,ReadablePathandWritablePathto real ABCs derived fromabc.ABC.Make
JoinablePath.parserabstract, rather than defaulting toposixpath.Register
PurePathandPathas virtual subclasses of the ABCs rather than deriving. This avoids a hit to path object instantiation performance.No change of behaviour in the public (non-abstract) classes.