This is exactly right, is and is a great example of what self-documenting code can be. The function itself could have a bit more explanation but any code callin

This is exactly right, is and is a great example of what self-documenting code can be. The function itself could have a bit more explanation but any code calling it is going to be obvious. The big difference is it looks deliberate, instead of just code written by someone trying to micro-optimize, be very clever, or who just didn't realize tolower() exists. Most people will pause before just replacing it, and likewise it should trigger questions in the PR.