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This was the decision at IETF 97 (see: https://github.com/rtcweb-wg/jsep/issues/381). It's simpler to not allow this (since there's no real need for it) rather than try to decide complex rules for it. BUG=webrtc:6864 Review-Url: https://codereview.webrtc.org/2566833002 Cr-Commit-Position: refs/heads/master@{#15559}