Poll: a nonstate keyword

[Steven Schveighoffer]

What if D2 were to introduce a keyword that allows you to decouple a class 
member from the class state for the purposes of const?  This keyword 
basically means that the member is stored with the class data but is 
unaffected by the constancy of an instance.  In other words, a non-state 
member variable is not cast to const when the class instance is cast to 
const.  This is an implementation of the 'is associated with' OO 
relationship.  This is similar to the 'mutable' keyword in C++, or the way 
mutexes work in D.

If this were to happen, would you consider this to be a positive, negative, 
or inconsequential change?

Would you stop using D because of it?

Would you switch to D2 because of it?

Would you consider this concept hard to explain or understand?