TraktClient's static per-refresh-token coalescer, initiating-vs-joiner branches, session-adoption identity checks, and both updateSession push methods defended a multi-client world production never creates — the one long-lived client is shared via TrackersProvider, and the two throwaway clients never refresh. Refresh now matches MalClient/MdblistClient's instance-coalescer shape. Simkl's _watchlistLoad field shadowed the identically-named coalescer on the mixin it applies (legal today, a trap on any future library merge) — renamed with comments distinguishing the two caches.
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