Is it possible, using the current stable Rust, to decode a hex string onto a [u8; 32] without a dummy initialization? The hex crate has a hex::decode_to_slice() and I've been staring at MaybeUninit, but it looks like the useful candidates are nightly-only.
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You can inline (unstable) MaybeUninit array helper functions yourself. Most of them are just wrapper around transmute and pointer cast for clarity.
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hex only accepts references to initialized slices. There is no way around initializing without getting UB.
You are saving three instructions with this optimization on x86_64. You will probably gain much more by spending time on a specialized hex decoding for your size.
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