[j_baker]

It would seem as though prototypes are the more expressive option if you can use them to simulate classes. In fact, one could argue that this is essentially what Python does.

...but the OP seemed to indicate that prototypes were "primitive", and it sounds like you agree with him. Are you trying to say something that I'm missing?

[olalonde]

That's not what expressiveness means. Classes can be simulated in assembly but assembly isn't very expressive.

[politician]

http://en.wikipedia.org/wiki/Expressive_power