Also somewhere in the documentation is noted that == is much cheaper than eq, so you may wanna use == whenever it makes sense.
in reply to eq vs. ==
UPDATE: i guess there is some misunderstanding here. My line above saying "so you may wanna use == whenever it makes sense" must be read as "please use == when comparing something that should be a number, because using eq to compare two numbers is much less efficient". On the other side using == to compare two strings is less likely to give the result you want, so i didn't consider that case. Hope now it's clear.