Converts UUID (GUID) to integer
From https://gist.github.com/therightstuff/9f83967b9c23354a27ed691a6b591b0c
uuidToInt('ffffffff-ffff-ffff-ffff-ffffffffffff'); // => '340282366920938463463374607431768211455'
intToUuid('585443547289696381'); // => '00000000-0000-0000-081f-e9cdf03f387d'
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