335 - tangle at labels scoped to functions
336
337 - rename 'continue' instructions to 'loop'
338 - starting to work on string primitives
339 - string literals for convenience

I'm cheating a little when it comes to strings, making use of Racket
primitives. But in principle it seems like a local transform to
implement even in machine code.
340
341 - standardize traces again
342 - strcat