Types schema doesnt work with arrayFormat: comma and one item in array

current behavior:
```ts
const queryString = queryString.stringify( { foo: ['bar'] }, { arrayFormat: 'coma' } );
// queryString: 'foo=bar'
const result = queryString.parse( queryString, { arrayFormat: 'coma', types: { foo: 'string[]' } } );
// result: { foo: 'bar' }
```
expected result: 
```ts
// result: { foo: ['bar'] }
```



version 9.1.1