On: Understanding and avoiding visually ambiguous char...

[jzwinck]

If you use both upper and lower case, you are likely to eventually be surprised by some third party system or protocol that is case insensitive. I even found a commercial system which allowed users to choose IDs with case sensitivity (iD and id being distinct) but if you query it for one which does not exist they do case insensitive matching and return the wrong data.

When I reported this bug they said it was for convenience!

[gajus → jzwinck]

Thanks for the anecdote. I've included it in the article.

[NetOpWibby → jzwinck]

What a nuts system