bug#56799: (gnu services configuration) usage of *unspecified* is problematic

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Hello Maxim,

On Wed Aug 17, 2022 at 2:16 PM BST, Maxim Cournoyer wrote:
> So instead of 'unset-value?', I'd use 'value-unset?', but since in this
> case we're dealing with a 'maybe' type defined with the 'define-maybe'
> macro, I'd keep 'maybe-value-unset?'.

How about `unset?` or `maybe-unset?`? (I am a native English speaker, but
to be honest I don't think that really matters much to this dicussion...)

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