To Do List
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- Universe polymorphism.
- Inductive datatypes.
- New representation for metavariables.
- New elaborator
- Add unification hints support in the Lean front-end.
- Improved extensible parser and pretty printer.
- Notation-sets for organizing user defined notation.
- Generic Tableaux prover.
- [MCSat](http://leodemoura.github.io/files/fmcad2013.pdf) framework.
- Independent type checker using a different programming language (e.g., F* or OCaml).
- New apply-tactic.