docs: public void writeVarbinary(byte[] bin) throws IOException {
          if (bin == null) {
              writeInt(VoltType.NULL_STRING_LENGTH);
              return;
          }
  
          if (bin.length > VoltType.MAX_VALUE_LENGTH) {
              throw new IOException("Varbinary exceeds maximum length of "
                                    + VoltType.MAX_VALUE_LENGTH + " bytes.");
          }
          writeInt(bin.length);
          write(bin);
      }