Can Romex touch the outside of a recessed can?

I am installing some recessed lights into an non-insulated ceiling. 3 of the
holes went fine, but when I cut the 4th hole, I discovered a bundle of three
romex wires running directly across the hole. I luckily did not cut or even
nick any of the wires.
I think I can get enough slack to push them to the side, but they will be in
direct contact with the can of the recessed light. The recessed lights I am
using are both IC and non-IC rated, but does that mean they can come in
contact with just insulation or with all combustibles?
The wires are NM-B that would be in contact with the can.
And the second part of my question, assuming the above is acceptable, could
long term exposure to high temps. cause it to prematurely get brittle and
crack?
I guess I'm more concerned if this is acceptable to code, not just that it
"will work".
Greg