docs: public void seqAdd(Object value) {
          Data.Seq s = (Data.Seq)data;
          int idx = s.idx;
          s.idx++;
          if(s.idx > s.capa) {
              s.capa += YAML.ALLOC_CT;
              s.items = YAML.realloc(s.items, s.capa);
          }
          s.items[idx] = value;
      }