code: private static final String debugId(Object o) {
      Long id = (Long)o;
      byte[] buf = new byte[8];
      ArrayUtil.writeLong(buf, 0, id.longValue());
      return HexUtil.toString(buf);
    }
docs: Write a Schema Id out as a hex string.
  
  @param o      The SchemaId
  
  @return String A hex string representaion of the SchemaId's long value.