Comment by burntsushi

`clone()` and `unwrap()` and `todo!()` without fear. Just let it loose.

For me, prototyping is, IMO, about finding shortcuts to demonstrate something that is unknown to you. The idea is that shortcuts represent things you know how to do, but would otherwise take work to avoid and aren't necessary for demonstrating the thing that is unknown. `clone()` and `unwrap()` are just Rust-specific examples of that.