title: How to store uuid as number?
body: <p>Based on the answer of question, <a href="https://stackoverflow.com/questions/2365132/uuid-performance-in-mysql/2365176">UUID performance in MySQL</a>, the person who answers suggest to store UUID as a number and not as a string. I'm not so sure how it can be done. Anyone could suggest me something? How my ruby code deal with that?</p>