I have a question about `KNilOptions` and `NSJSONReadingMutableContainers`.
i thank they have a same function.
Because `KNilOptions` Equal to Zero and `NSJSONReadingMutableContainers` too.

is it right?

```
NSDictionary * dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

```

// `NSJSONReadingMutableContainers is equal to kNilOptions`