Design & impl of async runtime?

What is a good in depth resource on the design / impl of async runtimes ?

The focus here is NOT how to use async io, but rather how async runtimes are implemented. (They seem too magical right now).

Thanks!

There's a very small runtime impl on this page:

You might also be interested in this introduction, which explains and implements a lean async runtime:

Demystifying Async Rust

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