My concern is slightly different; it's the ease of debugging. And I don't mean debugging the code that I (or sb else) wrote, but the ability to freely modify the code to kick some ideas around and see what sticks, etc. which I frequently need to do, given my field.

As an example, consider a pointer to a const object as a function param in C++: I can cast it away in a second and modify it as I go on my experiments.

Any thoughts on this? How much of an extra friction would you say is introduced in Rust?