Method IterableAt

api/src/main/java/io/grpc/Metadata.java:261–264

(Key<T> key, int startIdx)

    private int startIdx;

    private IterableAt(Key<T> key, int startIdx) {
      this.key = key;
      this.startIdx = startIdx;
    }

    @Override
    public Iterator<T> iterator() {