code: function preDefineAll(val: Object) {
    preDefine(val, STRUCT_STATE, dummy)
    preDefine(val, STRUCT_CHILD_RAW, dummy)
    preDefine(val, STRUCT_CHAIN, dummy)
    preDefine(val, STRUCT_ROOT, dummy)
    preDefine(val, STRUCT_CONTEXT, dummy)
  }
docs: Fix ie polyfill