code: public IByteCodeEnhancer byteCodeEnhancer() {
          if (IByteCodeEnhancer.INSTS.NULL == _byteCodeEnhancer) {
              _byteCodeEnhancer = get(CODEGEN_BYTE_CODE_ENHANCER);
          }
          return _byteCodeEnhancer;
      }
docs: Return {@link RythmConfigurationKey#CODEGEN_BYTE_CODE_ENHANCER} without lookup
  
  @return the byte code enhancer implementation