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Should be: 'John@Gıthub.com'.toUpperCase() === '[email protected]'.toUpperCase()

Our team at Wisdom has done the exact same. It's been confusing at times, but much better once we got going.

This was a very real and demonstrated vulnerability. Perhaps I've misunderstood your comment.

Unfortunately convention has normalised user expectations that email addresses are now case-insensitive. It's now a standard business requirement. Too bad few devs fully handle Unicode.

Yes! Add in a toLowerCase() in there as well.

An apparently small deviation with surprisingly large repercussions.