ref keys

[Jonathan M Davis]

On Monday, September 17, 2012 15:42:55 Namespace wrote:
> Until now it is possible to have const keys in assocative arrays,

Keys are supposed to be immutable. If that's not enforced by the compiler, 
then it's a bug. Given the current issues with the implementation for AAs' it 
wouldn't surprise me in the least if the compiler does not enforce this like 
it's supposed to, but regardless, that's the design. All AA keys must be 
immutable (or implicitly convertible to immutable) so that they can never
change and screw up your AA.

So, all AA key types are supposed to be inferred as immutable if they're not
explicitly marked as such, and any time that an AA is accessed, the key used
must either be immutable or implicitly convertible to immutable. And in the
case of classes, that means that it must be outright immutable.

- Jonathan M Davis