I did a contract project that consisted of porting a C app to asm.js/emscripten. Various C bugs gave results that had to be repeated precisely in javascript. S

I did a contract project that consisted of porting a C app to asm.js/emscripten. Various C bugs gave results that had to be repeated precisely in javascript. Several other contractors attempted to replicate the behavior using JS rewrites and failed. One said it was impossible (grin).