When case insensitivity is enabled via devise's `config.case_insensitive_keys` then `.find_for_authentication` method needs to be used instead of `.find_by` because second mentioned returns `nil` when valid email with different cases is passed. More info https://github.com/plataformatec/devise/wiki/How-To:-Use-case-insensitive-emails
		
			
				
	
	
	
		
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