Should labels include uppercase letters?

[theKidOfArcrania]

(Sorry i might be raising quite a few issues now, but...)

I noticed the current regex for matching labels is /[a-z_][a-z0-9_]+/ (in LABEL_REGEX), which only allows for lower case letters. Though typically, (for many programming languages) they allow both upper case and lower case letters when specifying an identifier.

Is this intentional or not?

[theKidOfArcrania]

This also means you cannot have labels of only one character

[david942j]

Yes I agree to include uppercase letters (and accept one-character label).
I don't remember why I limited it in lowercase only, maybe I was not in my mind when writing it :o