Document recommendations for using crates that have std types in public interface

[FeldrinH]

Perhaps I've missed an important part of the documentation, but it seems to me that using this crate with other crates that use std types in public api involves a lot of copying.

For example if I have a crate that manipulates Vec-s from the standard library and I then want to make those Vec-s accessible over ABI then I have no option other than to make a copy to RVec, which could be really bad for performance if the Vec-s are large.

Is this assessment accurate? Are the tradeoffs and recommendations for these kinds of situations documented somewhere? If not it would be useful if they were.