(`atom`, `var`, etc) with if/else ladders. (_in progress_)
- [ ] Inlining all built-ins and system call instructions.
- [x] Greatly reducing the number of instructions used to compile disjunctives.
- - [ ] Storing short atoms to heap cells without writing them to the atom table.
+ - [x] Storing short atoms to heap cells without writing them to the atom table.
- [ ] A compacting garbage collector satisfying the five properties of
"[Precise Garbage Collection in Prolog](https://www.complang.tuwien.ac.at/ulrich/papers/PDF/2008-ciclops.pdf)." (_in progress_)
- [ ] Mode declarations.