proposition: Lemma map_omap_mono {A B} (f : A → option B) (m1 m2 : M A) : m1 ⊆ m2 → omap f m1 ⊆ omap f m2.
proof: Proof. rewrite !map_subseteq_spec; intros Hm i x. rewrite !lookup_omap, !bind_Some. naive_solver. Qed.
imports: Coq(Permutation) stdpp(options)