We only need to strip the disambiguation from artist names, not the join strings.
Only execute `pathfields` expressions and functions if they are called with an `Item` argument. Otherwise, return an empty string.
Given an identical similarity, prefer MusicBrainz matches.
Move articles to the front of Discogs artist names.
Move match distance weights to an undocumented configuration setting.
Rename the `discogs` max rec setting to `non_mb_source`, so it can apply to all data source plugins.
Check for both track length and number difference independently when downgrading recommendations.