Vec<u2>, Vec<u4>?

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We have packed Vec<u128>, Vec<u64>, Vec<u32>, Vec<u16>, Vec<u8>.

We also have 'packed" Vec<u1> via bitvec - Rust

Are there builtins for 'packed' Vec<u2>, Vec<u4> ?

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No, this would need to be in a specialized crate similar to bitvec. I'm not aware of an existing crate for this.

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After some more searching, I found a few crates for handling packed slices of u4 values:

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