Invision must dogfood their own ui design tools, right? The thought of trying to mock up ui changes to their app within their app cracks me up.
For example, I work with cartographic data and the darn mathies and programmers stole all our words. So I end up performing a map on a Map of maps. Or managing vector of vector layers. Naming is hard but this is ridiculous.
Using mockup tools to make mockup tools probably has its own set of ridiculous collisions.
[1] https://en.wikipedia.org/wiki/Bootstrapping_%28compilers%29
However I apparently added some error in the language and the compiler was then broken, so I couldn't make my fix and re-transpile without checking out a clean version of the repo :D