Put the summary of the bug you're having here

What I expected to happen was...:
In the past versions Creepers needed light to be low like all other aggressive mobs.

What actually happened was...:
Ever since 1.3.2 I've had them blow up on me during the day in the middle of areas where light levels never drop below 8-9 and there are walls separating the area from the wilds beyond, one case being an area covered from wall to wall in half slabs.

Steps to Reproduce:
I don't know how to reproduce this issue. As I mentioned in the summary, it's creepers out of nowhere. And just creepers, I've yet to have any other mob attack me in the same conditions as noted.