}, ({ name, source, owner }) => {
      let expandedName = source && this._resolveLocalLookupName(name, source, owner) || name;

      let ownerGuid = guidFor(owner);

      return ownerGuid + '|' + expandedName;
    });

function identity(item: any) {
  switch (typeof item) {
    case 'string':
    case 'number':
      return String(item);
    default:
      return guidFor(item);
  }
}

  constructor(mixins: Mixin[] | undefined, properties?: { [key: string]: any }) {
    this.properties = properties;
    this.mixins = buildMixinsArray(mixins);
    this.ownerConstructor = undefined;
    this._without = undefined;

    if (DEBUG) {
      this[NAME_KEY] = undefined;
      /*
        In debug builds, we seal mixins to help avoid performance pitfalls.

        In IE11 there is a quirk that prevents sealed objects from being added
        to a WeakMap. Unfortunately, the mixin system currently relies on
        weak maps in `guidFor`, so we need to prime the guid cache weak map.
      */
      guidFor(this);
      Object.seal(this);
    }
  }

 compile(builder: any) {
   builder.wrapLayout(this.template);
   builder.tag.static('div');
   builder.attrs.static('id', guidFor(this));
   builder.attrs.static('class', 'ember-view');
 }