Rustaceans at the border

> sometimes it's literally just a matter of enabling the "no_std" feature flag, and you can use a bog-standard Rust library

To add to that, some of the requested libraries like pin_project and serde to my knowledge do not even really exist at runtime at all. There are a lot of utility crates like that which contain a bunch of fancy macro and type definitions, at most a few lines of which will actually end up in the final binary.