code: function setupEmulateDynamicDispatch (baseFn, overrideFn) {
    // If the override function does not call _super, then we need to return
    // the override function. If the base function does not exist, then we need
    // to return the override function.
    const callsBaseMethod = METHOD_CALLS_SUPER_REGEXP.test (overrideFn);
  
    if (!callsBaseMethod)
      return overrideFn;
  
    // Make sure the base method exists, even if it is a no-op method.
    baseFn = baseFn || function __baseFn () {};
  
    function __override () {
      let original = this._super;
      this._super = baseFn;
  
      // Call the method override. The override method will call _super, which
      // will call the base method.
      let ret = overrideFn.call (this, ...arguments);
  
      this._super = original;
  
      return ret;
    }
  
    __override.__baseMethod = baseFn;
  
    return __override;
  }
docs: Emulate the polymorphic behavior between the base function and the
  override function.
  
  @param baseFn
  @param overrideFn
  @returns {*}