Ooh, a programming version of the reversal test! (https://en.wikipedia.org/wiki/Reversal_test https://en.wikipedia.org/wiki/Reversal_test) That's always been a

Ooh, a programming version of the reversal test! (https://en.wikipedia.org/wiki/Reversal_test https://en.wikipedia.org/wiki/Reversal_test) That's always been a great trick for getting rid of "this is where we are, so justify all changes" and seeing whether your problem is one of inertia or real challenges.