[fw-mvc] Zend_auth .. is case sensitive

hi all zend developers

im using zend_auth for auth stuff of my application

i wanna disable the case sensitive check for usernames in zend_auth

for ex. USERNAME = username = UserName = useRnAme

?

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Sincerely
Sina Miandashti
MuSicBasE.ir & InvisionPower.ir Admin