code: public LuaPreparedScript endPreparedScriptReturn(LuaValue value, LuaScriptConfig config) {
          add(new LuaAstReturnStatement(argument(value)));
          return endPreparedScript(config);
      }
docs: End building the prepared script, adding a return value statement
  @param value the value to return
  @param config the configuration for the script to build
  @return the new {@link LuaPreparedScript} instance