What better way to learn than hearing some little(or big) pointers from your peers!
Seriously, don't worry about it! Have you ever been in a simmilar situation, where you got a bit of a code review? Sure, it is a humbling experience, but at the same time, you feel great to know that someone out there wants to help? Isn't that the beauty of the open source community??(other than sharing with others of course)
IMHO, you did this guy a favor, and like Marza said, if he gets pissed then he won't be writing long.
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perl -e '$a="3567"; $b=hex($a); printf("%2X\n",$a);'
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