Comment 1 for bug 570166

After review I've decided against this. "exec" and "call" operate quite differently, and they thus serve very different purposes. The key difference is that "call" does not create a new context where "exec" does descend into a new context. "call" does however use a virtual context for the "CallParams".

The one direction does work however, whatever can be called with "exec" can also be called with "call".