It does clone: https://stdrs.dev/nightly/x86_64-pc-windows-gnu/src/alloc/vec/mod.rs.html#2205-2212 https://stdrs.dev/nightly/x86_64-pc-windows-gnu/src/alloc/ve.

It does clone: https://stdrs.dev/nightly/x86_64-pc-windows-gnu/src/alloc/vec/mod.rs.html#2205-2212 https://stdrs.dev/nightly/x86_64-pc-windows-gnu/src/alloc/ve... it might be optimized to a memset, but it's the clone codepath, as opposed to the u8 specialization codepath as discussed in the article But the original commenter is talking about how the benchmark isn't useful because it doesn't touch memory, but you get similar results even if you do touch memory.