Currently your password generator has a length and what to allow, but not what to require. A more complete solution would be to "include numbers" and "include symbols" and "include different case", etc. Sometime a 10 character password is generated (like for me just now causing me to submit this thread) that doesn't contain a number.
I also don't like to see periods and equal signs in passwords, for example. There isn't a way to stop that. The "include symbols" option could be expanded to provide a "valid symbols" box with a list of potential characters to use.
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