Feature request: no-mutation memory focused version?

[GnomedDev]

I've recently developed https://lib.rs/small-fixed-array and I'm interested in using this crate in place of FixedArray<FixedString> but currently this library would waste 2 pointer sizes for capacity when that is unnecessary for my use case. Therefore, I'm requesting a FixedCompactBytestrings and a FixedCompactStrings wrapping it which are either based on Box<[u8]> (more standard) or my FixedArray<u8> (no alignment requirement, generic length type).