@mica/sdk (SDK contract v1)
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    Interface MusicError

    interface MusicError {
        code: number;
        reason: MusicErrorReason;
    }
    Index
    code: number

    The player's own code, kept rather than discarded once mapped. The in-game procedure in docs/testing-music-in-cef.md is the reason: "it did not play" and "it reported 150" are different bug reports, and only one of them can be acted on.