LinearMap with explicit SIMD support?

I don't know how much this would fit into this crate, but LinearMap could significantly win from SIMD search.
I have implementation of similar container that store keys in wide::simd packs. It works on top of "the usual" Vec, but it would be
not so hard to port it to heapless::Vec.

Alternatively - it is possible to implement SIMD search on existent LinearMap for supported SIMD types... But as far as I
know - only desktop CPUs have zero-to-none penalty for loading from non-aligned memory to register. And looks like you
aim for embedded hardware... So you probably "have" to explicitly use SIMD types as key packs.

I understand that simd types is not stable in Rust, and wide crate supports only desktop hardware... But as a suggested solution for that: we could have simple custom SIMD types/traits which will initially points to wide implementation. Than they could be expanded by community on as-need basis...

Start with the LinearMap entry point and review how it stores and searches keys, then compare the proposed wide::simd-pack approach with heapless::Vec and embedded constraints. Define the supported SIMD types or traits, portability expectations, and a measurable search outcome before implementation; the issue does not currently specify tests or a completion criterion.