docs: function FormArray(controls, validatorOrOpts, asyncValidator) {
          var _this = _super.call(this, coerceToValidator(validatorOrOpts), coerceToAsyncValidator(asyncValidator, validatorOrOpts)) || this;
          _this.controls = controls;
          _this._initObservables();
          _this._setUpdateStrategy(validatorOrOpts);
          _this._setUpControls();
          _this.updateValueAndValidity({ onlySelf: true, emitEvent: false });
          return _this;
      }