* gnu/services/audio.scm (%mympd-user, %mympd-group)
(mympd-user-sanitizer, mympd-group-sanitizer): New variables.
(mympd-configuration)[user]: Use user-account as value type.
Sanitize via mympd-user-sanitizer.
[group]: Use user-group as value type.
Sanitize via mympd-group-sanitizer.
(mympd-serialize-configuration): Adjust accordingly.
(mympd-accounts): Likewise.
* doc/guix.texi (Audio Services)[myMPD]: Likewise.
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
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