I tried to print a content of the `CharacterSet.decimalDigits` with:

```
print(CharacterSet.decimalDigits)

```

> 
> output: CFCharacterSet Predefined DecimalDigit Set
> 
> 
> 

But my expectation was something like this:

> 
> [1, 2, 3, 4 ...]
> 
> 
> 

**So my question is:** How to print content of the `CharacterSet.decimalDigits`?