The threshold of what the high code quality is was set long ago and remains far beyond the reach of the mere mortals. You will hardly find anything even distan

The threshold of what the high code quality is was set long ago and remains far beyond the reach of the mere mortals. You will hardly find anything even distantly approaching the quality of TeX and Metafont. Not sure if there are mirrors on github, but you can always grab a copy from CTAN.