* Every Op class must declare a `static constexpr NodeTypeInfo type_info{name, version}` in the class definition and define it in the .cpp file. See any op definition for an example.
* The boolean node method `is_type<T>` is for testing if a node is the op `T`.
*`T as_type_ptr<T>()` and `T as_typr<T>()` will upcast `Node` to an explicit op class if it is of class `T`, or `nullptr` if it is not.
*`T as_type_ptr<T>()` and `T as_type<T>()` will upcast `Node` to an explicit op class if it is of class `T`, or `nullptr` if it is not.
## Passes
*`LikeReplacement` pass must be run by all transformers.
