Updating a Chunk in a HashMap using HashMap.set

const key: Key = ...
const map: HashMap<Key, Chunk<Data>> = ...
const updatedChunk: Chunk<A> = pipe(
  Match.value(HashMap.get(map, key)),
  Match.when({ _tag: "Some" }, (_) =>
   Chunk.append(data.metadata)(_.value),
  ),
  Match.when({ _tag: "None" }, () => Chunk.of(data.metadata)),
  Match.exhaustive,
)

return HashMap.set(map, key, updatedChunk)