[icebraining]

Ultimately you don't, but ASCII_A requires double the intentional actions to name it and have it also be 'A', whereas 'A' vs 'E' or whatever else is a much easier typo.

Unless, as I wrote after, you have both ASCII_A and ASCII_E declared, which wouldn't be surprising.

I don't find the "spot the error" argument to be very convincing; I still name stuff, but just for the semantic value.