It looks like the C++ version always does the copy, regardless of whether or not the optional is empty, whereas Rust only bothers copying if there's anything th

It looks like the C++ version always does the copy, regardless of whether or not the optional is empty, whereas Rust only bothers copying if there's anything there. Is this a remnant of #[inline] on Option's Clone impl methods? With "larger" types (e.g. an optional several-GiB array) it seems like this could save some time depending on where things are in memory.