Mostly for tests. For every new type we want to compare in a test, we're
now going to start using some primitive that can parse its value from string. In this manner we can get syntax for literals in machine code.
Open question: parsing aggregates of aggregates. Like an array of structs.
This is the first time we allocate from the heap in standard library tests.
So we now need to start initializing the heap in all our apps.
Kartik Agaram