**Major change** compilef has been renamed to `fastfn` and is a property of `Model`. This allows us to always know the appropriate inputs to use even if the value you're compiling to a function is only associated with a subset of the variables.

The difference between `fn` and `fastfn` is that `fn` first calls `Point(*args, **kwargs) on its inputs, which is more convenient for manual usage, but slower. `fastfn` does not preprocess its input.