Type Tag not present in subclass

[philllies]

I tried to reproduce the polymorphism example from the readme. While subclassing appears to be working correctly, there is no $, nor any other property that would tag the subclass with the string I provide as third argument to mst, e.g., mst(code, model, "mysubclass).

Any idea why this is not working as intended?

[jjrv]

Did you pass the parent class prototype as the second parameter to shim?