Unbox 
by Julian Coy @eXamadeus
How can we build a type that "unboxes" arrays, functions, promises, and tuples?
Example:
```typescript
Unbox // string
Unbox<()=>number> // number
Unbox // boolean
Unbox> // boolean
```
Bonus: Can we make it recursive?
```typescript
Unbox<() => () => () => () => number> // number
```
Double Bonus: Can we control the recursion?
```typescript
Unbox<() => () => () => () => number, 3> // () => number
```
