docs: function defineMutationMembrane(prototype) {
    try {
      var pseudoFrozenProperties = {
        props: true
      };
      for (var key in pseudoFrozenProperties) {
        defineWarningProperty(prototype, key);
      }
      useMutationMembrane = true;
    } catch (x) {
      // IE will fail on defineProperty
    }
  }