✨ Features

- Implement `Const{Zero, One}` for xfe (50a9fb3a)
- (!) Use `num_traits::Const{Zero, One}` (60ed2b2b)

📚 Documentation

- Add docstrings to some MMR methods (b7244744)
- Improve some MMR-related documentation (382fa32d)

⚙️ Miscellaneous

- Make `Digest::LEN` an associated const (cb53ad64)

♻️ Refactor

- (!) Use `Const…` over `BFIELD_{ONE, ZERO}` (6210f44c)
- (!) Use `Const{Zero, One}` in `FiniteField` (a84927d4)
- (!) Un-deprecate `Digest::hash` (b95ba2c4)