code: func WriteFVPairArray(fields, values [][]byte, buf *goetty.ByteBuf) {
  	buf.WriteByte('*')
  	if len(fields) == 0 || len(values) == 0 {
  		buf.Write(NullArray)
  		buf.Write(Delims)
  	} else {
  		buf.Write(goetty.StringToSlice(strconv.Itoa(len(fields) * 2)))
  		buf.Write(Delims)
  
  		for i := 0; i < len(values); i++ {
  			WriteBulk(fields[i], buf)
  			WriteBulk(values[i], buf)
  		}
  	}
  }
docs: // WriteFVPairArray write field-value pair array resp