code: function (memberName) {
          var visibility = this._defaultVisibility;
          if (_GPF_VISIBILITY_UNKNOWN === visibility) {
              if (memberName.charAt(0) === "_") {
                  visibility = _GPF_VISIBILITY_PROTECTED;
              } else {
                  visibility = _GPF_VISIBILITY_PUBLIC;
              }
          }
          return visibility;
      }
docs: Compute member visibility from default visibility & member name