Surfaces metadata_enhancement.single_to_album as a checkbox in the Post-Processing
> Core Features section, next to the cover-art settings (it's about getting the
right album cover). Default OFF, wired like the replaygain toggle (load '=== true',
save raw .checked) since the generic data-config binding defaults a missing key to
ON. Registered the default in settings.py DEFAULT_CONFIG + config.example.json.
820ff20139