Optimised class names make browser debugging difficult

I wrote on twitter to ＠c̲hris̲epps̲tein about the difficulty caused by the optimised class names such as 'a, b, c' when trying to debug in the browser, then relate those class names back to your code, see tweets here https://twitter.com/_CalFlanagan/status/989510252067524608

I wanted to raise the issue here, as I am unaware as to whether or not this issue was addressed.

Chris mentioned that something was in the pipeline for this, but I'm unaware as to whether or not it was ever released?

The issue names no file, test, or entry point. First determine whether the previously mentioned pipeline work was released, then locate the current optimized class-name behavior. Done should include a clearly defined way to relate browser class names back to the source styles.

Written by the indexing model from the issue text.