What if you created elm.js and compiled your code, and fixed what doesn't work according to the changes (https://github.com/elm/compiler/blob/master/upgrade-doc

What if you created elm.js and compiled your code, and fixed what doesn't work according to the changes (https://github.com/elm/compiler/blob/master/upgrade-docs/0.19.md#changes https://github.com/elm/compiler/blob/master/upgrade-docs/0.1...)?