> accepting upper case letters (making usernames case sensitive) would tend to complicate things a bit. Maybe they should be allowed at the entry box but then lower-cased before storing them.
This is the present logic, at least in Moodle 1. This has its own problems.
a) Can you extend that to utf-8?
b) There were people who expected the same logic for passwords, i.e. case insensitive!
> I would add the plus sign, as it is an allowed email address character. In fact, I use quite a lot when registering at some sites.
I have personally nothing against, if it works everywhere. For example all the authentication systems Moodle supports must understand the + and all third party modules, plug-ins, etc. too.
Moodle community sites
Moodle documentation: "Allow extended characters in usernames" info
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