[pjmlp]

Thanks for the thoughtful reply.

You are right, however there is a scenario that you have forgotten.

The possibility that the JIT might eventually optimise the code path given enough PGO data, and apply RVO or similar approaches.

Naturally I don't know if RyuJIT can already do this kind of optimization, given that only recently they have strengthened their focus on this area.

However this kind of optimizations are already doable in Graal, so it is possible that Microsoft also adds them to RyuJIT.

Which in any case would rule out some of the Rust deployment scenarios I guess.