Those class names surely gzip better than hashes over the wire?

Here's a comparison using `brotli --best` on my app.

   53K _long.css
   38K _short.css

   11K _long.css.br
  8.9K _short.css.br

Besides download size, smaller names improve parsing speed too.

This.

The only thing hashing classes achieves is making it difficult for users to use ad blockers and/or custom CSS. I understand why e.g. Meta does it on their sites, but for GitHub it makes no sense.