Function flatten

flatten<T>(opt: Option.Option<Option.Option<T>>): Option.Option<T>
Flattens the nested optional.
Type Parameters
- T
Parameters
- opt: Option.Option<Option.Option<T>>
  The nested optional.
Returns Option.Option<T>
The flattened optional.

Examples
Example
```
expect(flatten(some(some(6)))).toStrictEqual(some(6));
expect(flatten(some(none()))).toStrictEqual(none());
expect(flatten(none())).toStrictEqual(none());
```
- Defined in src/option.ts:250