Is your feature request related to a problem? Please describe.

Path values are unfit for use as a "path string" replacement because for example

''
  HomeDirs: ${/home}
''

tries to add /home to the store.

In my experience, the only appropriate use is for referencing source files and locations within a repository. These path values are all created with relative path literals.

Describe the solution you'd like

Add an experimental feature flag or setting that disables absolute path literals such as /. and /home or /var/lib/foo.

Describe alternatives you've considered

• Status quo. Keep telling users not to write absolute path literals
• Deprecate them even more. Users would have to opt out of this flag to use /..

Additional context

Priorities

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