Guard against prototype extended arrays #769
Merged
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Certain frameworks like Ember extend the array type with additional properties. Although they can be disabled ( https://guides.emberjs.com/release/configuring-ember/disabling-prototype-extensions/ ), it would remove some helpful functionality. In the case, the iteration through the additional properties by the execute validator code can result in
undefined
being passed as the third argument. The code change guards against that case.