import { EmplaceableWeakMap } from "https://deno.land/x/composite_key@1.0.0/deps.ts";
WeakMap with Emplaceable implementation.
x/composite_key/deps.ts>EmplaceableWeakMap
import { EmplaceableWeakMap } from "https://deno.land/x/composite_key@1.0.0/deps.ts";
WeakMap with Emplaceable implementation.