Should the hash tables in circuitmux_t have channel ID in them?
(per discussion with nickm and skruffy in #tor-dev on 2015-02-02)
Arguably using (channel_id, circuit_id) pairs rather than bare circuit IDs in the hash table in a circuitmux (circuitmux_t.chanid_circid_map) is generality we never actually used and we should consider whether we can eliminate it and save memory.
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