That is pretty neat too. Generally speaking, if there is a standard function that does what I need, I prefer it. Two reasons:
* The code is concise: In `c in 'A'..'Z'` the reader has to infer what you are testing, whereas in `c.isUpperAscii` you need 0 brain cycles, it is obvious. In this particular case, though, the range check is very intuitive. * Performance: If there is a function in the standard library that does what I need exactly, chances are it is using the most performant implementation possible. In the rare case that it does not, you send a patch. Those are two generic principles of mine, but thanks for the alternative!
