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There's a case in webrtc GracefulClose (https://github.com/pion/webrtc/pull/2847/files#diff-61936a3824ea2f65378ca63d509769a4dc6b52a1685845f764089fe03de2f4c3R213-R216) where it would be beneficial to wait for the ICE agent to gracefully close but due to how Mux works, it's hard to thread it through without calling GracefulClose and then Close on the agent. That makes an error happen that doesn't seem necessary. If you close twice, that feels okay.