Functions required for parsnip-adjacent packages
These functions are helpful when creating new packages that will register new model specifications.
null_value(x) show_fit(model, eng) update_dot_check(...) new_model_spec(cls, args, eng_args, mode, method, engine) check_final_param(x) update_main_parameters(args, param) update_engine_parameters(eng_args, ...) is_varying(x)
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