Entering numbers too quickly bypasses formatting

[DrBeak1]

Tapping numbers too quickly in BKNumberField breaks formatting and is not recoverable unless the view is reloaded. I believe it's due to cardPatternInfo not being properly instantiated fast enough. We end up with BKCardNumberFormatter.cardPatternInfoWithNumberString returning nil and setting self.cachedPrefix and self.cardPatternInfo to nil. This then never recovers. I can try to find a solution, but don't have time at the moment. Just wanted to point it out for now.