proposition: Lemma umfilt_last A (h : natmap A) : um_filter (le (last_key h)) h = h.
proof: Proof. by apply: umfilt_le_last. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval) pcm(options prelude pred finmap rtc seqext useqord uslice uconsec)