OMG, someone recommending against modules! <simpsons voice="Chief Wiggum">Get 'em boys</simpsons>. Seriously though the reason for using autouse in this case is the same as any situation in where you can use a module over rolling your own. There's also the fact that autouse != eval 'use Module'. Although it's not necessary I think I'd prefer to use a core module over my own code, but as always TIMTOWTDI.
HTH

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broquaint