whole_func_string: function(value) {
        if (!value) {
          return null;
        }
        if (!qx.lang.Type.isArray(value)) {
          return [ value ];
        }
        return value;
      }
func_code_string: function(value) {
        if (!value) {
          return null;
        }
        if (!qx.lang.Type.isArray(value)) {
          return [ value ];
        }
        return value;
      }
func_documentation_string: Transforms values to make sure that they are an array (and never null)