> After processing options, guix need to "expanduser()" (as it is called > in Python) on all arguments which are paths.
Please don't do it. UNIX has its warts, and this is a well-known one (use ${HOME} instead). If we did expanduser, I'm sure we'd be seeing bug reports about paths where there was a tilde in the actual file name, NOT as a expanduser mark. UNIX tools do what they do, and this wart is here to stay in a lot of tools. Then at least make it consistent across all the tools UNIX has.
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