import { BiMultiMapNonEmpty } from "https://deno.land/x/rimbu@1.0.0/bimultimap/custom/implementation/immutable.ts";
Returns
WithKeyValue<Tp, K, V>["builder"]
x/rimbu/bimultimap/custom/implementation/immutable.ts>BiMultiMapNonEmpty#toBuilder
import { BiMultiMapNonEmpty } from "https://deno.land/x/rimbu@1.0.0/bimultimap/custom/implementation/immutable.ts";