A QA engineer walks into a bar, and orders a beer.
Then he orders 0 beers.
Then he orders 999999999999 beers.
Then he orders an aardvark.
Then he orders nothing.
Then he orders -1 beers.
Then he orders NULL beers.
Then he orders asnwikfjsdf.
Then he orders a "><script>give_me_your_credit_card...
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