fdmanana/couchdb — comment on commit c574d29bb92f2b61688b52e2e03548b05cc4a163
File: src/couchdb/couch_changes.erl line 57
By fdmanana:

Probably not, specially for requests coming via HTTP.
But for internal use (other modules using couch_changes), a caller can call couch_changes N times in a row, so when it starts it might have a last_changes_heartbeat from a previous call.