I agree, but I wouldn't expect my line ending preferences to make tests fail. I think that with the move to GitHub already underway, it's not unreasonable to (at least consider to) add a .gitattributes file. Added Brett to nosy since he's responsible for PEP 512.

(I think this should be changed before the final announcement that the cpython repo is on GitHub, but there's no rush until then; although I'm certainly not going to complain if it's done before ;)