documentation for 'upon', less intercapping
better doc for input; not good, but better
the machine itself is private, outputs are private
Simpler implementation of input processing.
Even simpler implementation strategy.
a whole bunch of notes to self
it may surprise some of our viewers tonight to learn that mutable state is bad
Fix the test.  Fix the global mutable state by adding more global mutable state.  Hooray.
exceptions about input methods should look like they're about the input method
uh, that *should* have worked, right?