Member Junction
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    SessionEndReason: "explicit" | "error" | "deadline"

    Why a call ended, as the runtime reports it on SessionEnded$: 'explicit' when the host or user ended it, 'error' when the runtime ended it over a failure, 'deadline' when it ended because the session deadline was reached (the runtime's own auto-end, or a host's EndRealtimeSession('deadline')).