`**` does not work when in parentheses

The following prints `false` when I'd expect it to print `true`:
```
const pm = require('picomatch');

console.log(pm('test(/utils/**)')('test/utils'));
console.log(pm('test?(/utils/**)')('test/utils'));
``` 

On the otherhand, `pm('test/utils/**')('test/utils)` behaves as expected
