The below snippet results in the symlink "/home" resolving as expected. However, documentation at https://docs.python.org/3.7/library/pathlib.html#pathlib.Path.resolve suggests, "If strict is False, the path is resolved as far as possible and any remainder is appended without checking whether it exists."

>>> from pathlib import Path
>>> host_path_str = "/home/somewhere/there/../nowhere"
>>> host_path = Path(host_path_str)
>>> host_path
PosixPath('/home/somewhere/there/../nowhere')
>>> host_path.resolve()
PosixPath('/System/Volumes/Data/home/somewhere/nowhere')

Expected results (based on the wording above): 

>>> host_path.resolve()
PosixPath('/System/Volumes/Data/home/somewhere/there/../nowhere')

Right now the ".." pieces are universally removed. I'm not exactly sure exactly how symlinks resolve, but this might create unexpected results. 

No part of the path component "somewhere/there/../nowhere" exists. When strict=True this would yield an error. So when strict=False, and it doesn't resolve, documentation implies that would be re-added to the resolved section.

Hi, 

I don't understand the point here. If you go back on a folder
'..', IMO has more sense remove the '..', that is a way to 
resolve it

I'd prefer to leave ".." in the path, at least with PosixPath. (It doesn't matter with WindowsPath.) The "there" component may be a symlink that's currently inaccessible. That said, Python's os.path.realpath() has a long history of naively resolving ".." components in the remainder.

Adding a patch that fixes this issue, for future reference. I'm not too sure this would be the right way to solve this. The patch also causes 5 failures in test_posixpath.py that would have to be fixed (most likely all can be fixed by creating respective dirs).

Another solution would be to base it on `strict` parameter:

- strict=True, subpath exists => resolve `..`
- strict=True, subpath doesn't exist => throw OSError
- strict=False => never resolve `..`

This would avoid extra `lstat()` calls but would be a much bigger change in terms of behavior.