`os.pwd / "../folder/../Out.txt"` seems to be allowed despite being a non-canonical sub-path

[lihaoyi]

Seems like we should error and ask people to us "../Out.txt"? @pawelsadlo what do you think?

[pawelsadlo]

@lihaoyi
I am not sure how would it behave in case folder is symlink.
We should check what is behavior in case of symlink without literal. - os.pwd / ".." / folder / "Out.txt"

[lihaoyi]

Mill already normalizes os.pwd / ".." / "folder" / ".." / "Out.txt" to os.pwd / ".." / "Out.txt" on-creation, even before we perform any filesystem operations, so whether symlinks behave correctly or not, those are the semantics we already use