`0` value is mistakenly skipped in item validation

[KubaJastrz]

selectivity v3.1.0
react v16.4.1

When I create an item list like this:

const items = [
    { id: -1, text: "-1 -- works" },
    { id: 0, text: "0 -- doesn't work" },
    { id: 1, text: "1 -- works" },
    { id: "-1", text: "'-1' -- works" },
    { id: "0", text: "'0' -- works" },
    { id: "1", text: "'1' -- works" }
];

And pass it down to Selectivity component:

<Selectivity.React items={items} />

Value of 0 is not properly recognized as a valid item in the dropdown menu.

I've also made a live example, so you can see it better.