Lib.rs

The modules in this crate a thin interfaces to builtin-actors, so that the rest of the system doesn't have to copy-paste things such as actor IDs, method numbers, method parameter data types.

This is similar to how the FVM library contains copies for actors it assumes to be deployed, like the init-actor. There, it's to avoid circular project dependencies. Here, we have the option to reference the actor projects directly and re-export what we need, or to copy the relevant pieces of code. By limiting this choice to this crate, the rest of the application can avoid ad-hoc magic numbers.

The actor IDs can be found in singletons, while the code IDs are in builtins