@NotNull
  static ConcurrentBitSet readFrom(@NotNull DataInputStream inputStream) throws IOException {
    IntList list = new IntArrayList();
    while (inputStream.available() > 0) {
      list.add(inputStream.readInt());
    }
    return new ConcurrentBitSetImpl(list.toIntArray());
  }
@NotNull
  static ConcurrentBitSet readFrom(@NotNull DataInputStream inputStream)