I feel like the semantics of PurePath.suffix 
(https://docs.python.org/3/library/pathlib.html#pathlib.PurePath.suffix) and 
PurePath.stem define this pretty unambiguously.

I.e., it should be:

p = Path("foo.bar.txt")
p.with_stem("quux")
  "quux.txt"
p.with_stem("baz.quux")
  "baz.quux.txt"
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