[REST] DataFilter validating among conditions with multiple operands

[az-joss]

What steps will reproduce the problem?

I have configured IndexAction in controller like fallow

    public function actions()
    {
        $actions =  ArrayHelper::merge(
            parent::actions(),
            [
                'index' => [
                    'dataFilter'          => [
                        'class'        => ActiveDataFilter::class,
                        'searchModel'  => function () {
                            return (new \yii\base\DynamicModel([
                                'tags'     => null,
                                'counties' => null,
                            ]))
                                ->addRule('tags', 'each', ['rule' => ['integer']])
                                ->addRule('counties', 'each', ['rule' => ['integer']]);
                        },
                    ]
                ],
            ]
        );

        return $actions;
    }

As you can see, expect to use this attributes like an array of integers
When I use operator in in filter param as fallow:

http://somehost.com/endpoint?filter[tags][in][]=5&filter[tags][in][]=6

Validation of DynamicModel fails because-of passing value not as an array and as each element of an array.
If change DynamicModel rules definision as fallow:

...
     ->addRule('tags', 'integer')
     ->addRule('counties', 'integer');
...

It works fine for IN condition but not for the simple conditions
I've traced it and found this, where loop over an array goes and validator recives element and not all list as expected..

Additional info

Q	A
Yii version	2.0.14
PHP version	7.0.30
Operating system	MacOS 10.13.6

[yii-bot]

Issue moved to https://github.com/yiisoft/yii-rest/issues/19