code: func (stream *Stream) WriteUint16(val uint16) {
  	q1 := val / 1000
  	if q1 == 0 {
  		stream.buf = writeFirstBuf(stream.buf, digits[val])
  		return
  	}
  	r1 := val - q1*1000
  	stream.buf = writeFirstBuf(stream.buf, digits[q1])
  	stream.buf = writeBuf(stream.buf, digits[r1])
  	return
  }
docs: // WriteUint16 write uint16 to stream