"So I implemented `PurePath.__len__` as `str(len(path))`." Sure you meant len(str(path)), right?
"Serhiy and Remi objected, because it might not be obvious that the length of the path would be the length of string." I find this _really_ unintuitive. If anything, I would expect len(p) to be the "depth" of the path, which doesn't make a lot of sense if it is not an absolute path. It is a -1 from me because, besides what I outlined above, if you need the length of the string representation, len(str(p)) is quite short and obvious already.
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