> Regarding preallocation, you tend to want to avoid dynamic memory allocation in high performance applications anyway, so whether you do that in C++ or in Julia, doesn't really make too much of a difference.

Yes! Which is why it shouldn't take me digging through 3 different documents and still getting it partly wrong!

C/C++/Rust make this easy by annotating the type modifiers(&/*/Box/etc) with how the object lives in my runtime system. Rust even gets bonus points for giving me aliasing information as well(&mut vs &).