RangedSet.isCidrAble() incorrect results

```
import ipNum from "ip-num";

const range = ipNum.RangedSet.fromRangeString( "1.2.3.4-1.2.3.4" );

console.log( range.isCidrAble() ); // false
```
Why it is `false`? This range can be presented as `1.2.3.4/32`;