Until now it is possible to have const keys in assocative arrays,
e.g. Tile[const Vector2s], but it isn't possible to have ref
keys, e.g. Tile[ref Vector2s].
If I have this code:
[code]
class A { }
A a1 = new A();
int[A] array;
[/code]
I can do:
array[new A()] = 42;
array[a1] = 23;
Both lines are valid.
But if I would access the elements later with their keys, I can't
because I have not a valid key for the element 42, only for 23.
so my suggestion is: allow ref keys.
int[ref A] array;
array[new A()] = 42; // <-- error, new A() isn't a lvalue
array[a1] = 23; // <-- fine
