proposition: Lemma updE k v f : upd k v f = to (UM.upd k v (from f)).
proof: Proof. by []. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval) pcm(options prelude pred finmap rtc seqext useqord uslice uconsec)