This is an incredible exciting development. One thing I would like to point out is that the existence and progress of this PR is showing that there has been a change in approach in Rust over the last year or so which wasn't there previously. A lot of long standing issues were basically blocked on them just being too big to solve due to the surface area. Now the Rust project is more willing to slice problems down into smaller sets and giving those a try.

This ABI will be limited, but despite those limits it has a lot of utility.