As per @nmccready in gulp-sourcemaps/gulp-sourcemaps/issues/290
I just wanted to make a note here that we should possibly consider something other than css for doing our css mapping. It has numerous problems and does not seem to be very active. It is responsible for many of the closed bugs that relate to sass and css mapping problems.
As per @nmccready in gulp-sourcemaps/gulp-sourcemaps/issues/290
Maybe we can use PostCSS?