To add to this, async in Python is also plain buggy. For example, uvicorn is the most popular FastAPI server, and it leaks contexts across requests in the default installation.

The bug has been open for 2 years, with zero fucks given. The workaround is "just use libuv": https://github.com/encode/uvicorn/issues/2167

I've seen other such cases, and I just gave up on trying to use async.