And while we're talking hex semantics, is it just me being old, or do lower case letters in hex values bother anyone else?
The only time I've been OK with this is when I've had to work with machines that only have seven-segment displays.
Is uppercase the older tradition? I'm ~30yo and I've been seeing both for as long as I remember.
says "The characters "a", "b", "c", "d", "e", and "f" in an IPv6 address MUST be represented in lowercase "[1]
One Reason for this, is that it can avoid redundancy if you submit a hexdecimal nummber by phone.
"However, when a letter is spelled uppercase,people tend to specify that it is uppercase, which is unnecessary information."[2]
If you care about typography and think mixing lower-case letters with upper-case numbers, you could argue, that oldstyle numbners aka. lower-case numbers could be a better fit.