> vec_seq = Vector(seq)
> (vec_seq * 2).name.upper()
> # ... bunch more stuff
> seq = vec_seq.unwrap()
what type would .unwrap() return?
The idea—and the current toy implementation/alpha—has .unwrap return whatever type went into the Vector creation. Might be a tuple, list, set, deque, or it might be an iterator. It might even be some custom collection that isn't in the standard library.
But you can also explicitly make a Vector into something else by using that constructor. Pretty much as I gave example before:
set(Vector(a_list)) # Get a set
Vector(a_list)).unwrap() # Get a list (without needing to know type to call .unwrap())