NSNumberFormatter maximumFractionDigits and maximumSignificantDigits bug

问题

Is this a bug when using maximumFractionDigits and maximumSignificantDigits together on NSNumberForamtter on iOS 8?

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.maximumFractionDigits = 2;  
formatter.maximumSignificantDigits = 3;
NSLog(@"%@", [formatter stringFromNumber:@(0.3333)]); // output 0.333 expected 0.33

It works fine if I only use maximumFractionDigits

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.maximumFractionDigits = 2;
NSLog(@"%@", [formatter stringFromNumber:@(0.3333)]); // output expected .33

来源：https://stackoverflow.com/questions/27644341/nsnumberformatter-maximumfractiondigits-and-maximumsignificantdigits-bug