jekyll/jekyll — pull request #3171 by akoeplinger (2014-11-29 14:16:06+00:00)
Title: Add a Jekyll doctor warning for URLs that only differ by case

Those URLs are problematic on case-insensitive file systems because one of the URLs is overwritten by the other. Fixes #3035.

Note: I can't seem to find tests for doctor, I'm assuming there are none?