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That's a surefire way to increase customer support load, as users have mix case for their emails all the time. They might sign up on a phone, or login on a phone. They might just be hamfisted. Sure, it might be their problem, but they'll make it yours.

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And people forgetting caps lock down for their passwords is so common that many UIs actually show a little caps lock icon in there to warn you

Some places even support the same password with inverted caps. So say, if your password was "passWORD", then "passWORD" and "PASSword" would work. If the first hash fails, they'll invert the case, re-hash, then check again.

*accidentally enable caps lock

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