import { decodeAreaInArea } from "https://deno.land/x/willow_utils@0.8.0/mod.ts";
Decode an Area relative to a known outer Area.
https://willowprotocol.org/specs/encodings/index.html#enc_area_in_area
Parameters
opts: { decodeSubspaceId: EncodingScheme<SubspaceId>["decode"]; pathScheme: PathScheme; }
outer: Area<SubspaceId>