Hi,
I work on a graphic calculator for the company Numworks. We have a Python app that uses MicroPython. We fixed some issues when using uPY on emscripten and successfully got it running.

Among the issues we found and fixed:

• MicroPython assumes the stack is descending, which is not the case on emscripten.
• We had trouble with garbage collection as explained in emscripten’s portability guidelines.

Would you be interested in some PRs to get a working Emscripten build?

(By the way, this could be interesting for issues #3313, #2618 , #1561, #888)