Normalize a track identifier to its numeric form.
Identifiers may arrive as a plain id ("42") or in the compound "{trackId}:{albumId}" form; both collapse to the numeric track id.
"42"
"{trackId}:{albumId}"
The track identifier, numeric or string.
The numeric track id.
Normalize a track identifier to its numeric form.
Identifiers may arrive as a plain id (
"42") or in the compound"{trackId}:{albumId}"form; both collapse to the numeric track id.