Prune createAnswer()'s encodings and [[SendEncodings]] in sLD(answer). by jan-ivar · Pull Request #2801 · w3c/webrtc-pc
A follow-up to #2758 whose intent was to defer pruning of [[SendEncodings]] to sLD(answer), but mistakenly relied on the spec's existing pruning language which only applies to sRD(answer).
This adds similar language to sLD(answer), and fixes createAnswer() to direct JSEP on what to prune so pruning actually happens.