for (E e : unfiltered) {
        if (predicate.apply(e)) {
          size++;
        }
      }
      return size;
    }

    @Override
    public @Nullable Object[] toArray() {
      // creating an ArrayList so filtering happens once
      return Lists.newArrayList(iterator()).toArray();
    }

    @Override
    @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations

      for (E e : unfiltered) {
        if (predicate.apply(e)) {
          size++;
        }
      }
      return size;
    }

    @Override
    public @Nullable Object[] toArray() {
      // creating an ArrayList so filtering happens once
      return Lists.newArrayList(iterator()).toArray();
    }

    @Override
    @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations