ref: 79d1fe1cf2eb6748e2c12ffe9c36a678655302b1
dir: /TODO/
1) Add a repl 2) Figure out how to print the final bindings after running a query 3) Stop comparing strings all the time 4) Stop copying the entire goal stack into every choicepoint 5) Stop creating choicepoints when it is not needed 6) How to implement builtins nicely?