Falsy values are converted to null

[simplesmiler]

When you set a falsy value (0, '', false, etc.), you will get null instead of the value.

Example:

request.yar.set('visits', 1);
console.log(request.yar.get('visits')); // logs 1

request.yar.set('visits', 0);
console.log(request.yar.get('visits')); // logs null

Version: 9.0.1
Happens in this line https://github.com/hapijs/yar/blob/v9.0.1/lib/index.js#L155

If this is not an expected behavior, ping me and I will make a PR.

[hueniverse]

Seems like a bug. PR would be great.

[lock]

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