docs: public static byte[] yaml2byte(byte[] yamlstr) {
          Parser parser = Parser.newParser();
          parser.str(Pointer.create(yamlstr, 0), null);
          parser.handler(new BytecodeNodeHandler());
          parser.errorHandler(null);
          parser.implicitTyping(true);
          parser.taguriExpansion(true);
          Bytestring sav = (Bytestring)parser.parse();
          if(null == sav) {
              return null;
          } else {
              byte[] ret = new byte[Bytestring.strlen(sav.buffer) + 2];
              ret[0] = 'D';
              ret[1] = '\n';
              System.arraycopy(sav.buffer, 0, ret, 2, ret.length-2);
              return ret;
          }
      }