Hi, I'm one of the PhD students leading the work on Hydro!
DFIR is more of a middle-layer DSL that allows us (the high-level language developers) to re-structure your Rust code to make it more amenable to low-level optimizations like vectorization. Because DFIR operators (like map, filter, etc.) take in Rust closures, we can pass those through all the way from the high-level language to the final Rust binaries. So as a user, you never interact with DFIR.
DFIR is more of a middle-layer DSL that allows us (the high-level language developers) to re-structure your Rust code to make it more amenable to low-level optimizations like vectorization. Because DFIR operators (like map, filter, etc.) take in Rust closures, we can pass those through all the way from the high-level language to the final Rust binaries. So as a user, you never interact with DFIR.