TODO


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* Stop comparing strings all the time
* Stop copying the entire goal stack into every choicepoint
* Stop creating choicepoints when it is not needed
* How to implement builtins nicely?
* Right now we copy and allocate a lot, but almost never free stuff.
* Many builtins should really throw an error, but they just fail for now.
* Exceptions (throw, catch)
* Modules (I try to do something like SWI prolog for now, but I know there is also an iso standard)

The following builtins:
'='/2 needs to do something about the occurs check
unify_with_occurs_check/2: not implemented
'\\='/2: handle occurs check

* Handle overflow and uderflow in arithmetic