I am looking for re-implementations, in recent years, of the TeX core algorithm (which Knuth wrote in ca. 1982).
It would seem to me that LaTeX, XeTeX, LuaTeX all call the TeX core, which is written in the quaint Pascal-WEB. They convert the WEB program to Pascal or C by automated tools, right? There does not seem to be fresh rewriting of TeX core in more modern languages.
Related question: More Modern Reimplementations of TeX, but that is 8 years ago. If, in this decade, there is any project of new radical rewriting, I would be very willing to study the code.
Besides LuaTeX, is there any completely (or almost completely) re-implementation of the whole TeX core algorithm, which does not use WEB? For example, there is a guy who reportedly implemented TeX core algorithm in Clojure, but I cannot find any trace of it on GitHub. Additionally, there is a paper, which says the authors implemented TeX core algorithm in SML, but that is very long ago, and the source does not seem to have been made public.
Since I am citing new material, this is not a duplicate, I think. Of course, do correct me if any statement is wrong, or any link is mistaken.