A video with two audio tracks sharing the same language (common when
an upload was retried before the first attempt finished syncing) used
to show both rows in the player's language picker, leaving the viewer
guessing which one to pick. Dedupe keeps the first occurrence per
(language, label) pair — so legit variants like "en — Original" and
"en — Director's cut" still coexist, but bare duplicates collapse.
Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
