docs: public Deferred<byte[]> resolveTagkName(final TSDB tsdb) {
      class ResolvedCB implements Callback<byte[], byte[]> {
        @Override
        public byte[] call(final byte[] uid) throws Exception {
          tagk_bytes = uid;
          return uid;
        }
      }
      
      return tsdb.getUIDAsync(UniqueIdType.TAGK, tagk)
          .addCallback(new ResolvedCB());
    }