Overloading Functions with Refinements

    const [formFieldsChunk, leftoverParts] = yield* _(
        Stream.peel(
            stream,
            // collectAllWhile doesn't take a Refinement :-|
            Sink.collectAllWhile((a): a is Field => a._tag === 'Field'),
        ),
        a =>
            a as Effect.Effect<
                Scope.Scope,
                never,
                readonly [Chunk.Chunk<Field>, Stream.Stream<never, never, Part>]
            >,
    );