personal-site VS markdown-it-texmath

A GitHub bug I recently noticed that seems related:

Expected: When a repo's readme is named `README` (without the `.md` suffix), it is rendered as plain text. When a repo's readme is named `README.md`, it is rendered as Markdown.

Actual: When a repo's readme is named `README` (without the `.md` suffix), the presence of `$` causes parts of the file to be rendered as math. For a real-life example, see the readme in https://github.com/idianal/personal-site.

Can someone please point me where I can submit a bug report/issue for this?

Github's implementation is really lazy. There are many much better approaches to precisely this problem. E.g., Jupyter notebooks implement one that has matured in the wild over a decade. There's this very flexible markdown-it plugin that implements anther https://github.com/goessner/markdown-it-texmath, and my version of it here https://github.com/sagemathinc/cocalc/blob/master/src/packag... which I rewrote in typescript with a focus on the same semantics as Jupyter has, but for CoCalc, and I've been working on using unifiedjs to provide more general latex for Markdown (not just formulas) here https://github.com/sagemathinc/cocalc/pull/5982 Parsing math is much easier if you use a plugin to an existing markdown parser, rather than trying to do some hack outside of that (which is what Github probably does, and also what Jupyter does).

If you use a proper markdown plugin to parse math instead (such as https://github.com/goessner/markdown-it-texmath), then the problems pointed out in this blog post go away.