docs: function (parentType, childType) {
          if (!jv._options.checkInheritance) {
              return true;
          }
          var typeRef = childType;
          while (!typeRef[jv._MD_BUILTIN]) {
              if (parentType == typeRef) {
                  return true;
              }
              typeRef = typeRef[jv._MD_PARENTDEF];
          }
          jv._logError(jv.INHERITANCE_EXPECTED, [childType[jv._MD_TYPENAME], parentType[jv._MD_TYPENAME]]);
          return false;
      }