Cleanup some warnings from Clippy

[mcarton]

For information, here is the log before and after with Clippy.
Remaining warnings from Clippy are mostly false positive.

[Ogeon]

Ah, nice! Some, if not many, of those are old relics from when Rust was different... Nice to see them being found and cleaned out. I guess I should start checking with Clippy from time to time.

Some of the remaining ones are most likely necessary or doesn't really matter, but at least the last once about &Vec<...> sounds like it can be safely fixed. I can't imagine a reason for doing like that, except a brain slip. I'm fine with leaving them as they are for now, unless you want to give it another go.

[mcarton]

I wasn't sure about that one since it changes some public interface.

[Ogeon]

No, that one is safe to change. I have hidden it from the docs and written a warning.

[Ogeon]

The tests are nice and green. Thank you!

@homu r+

[homu]

📌 Commit 7986f31 has been approved by Ogeon

[homu]

⚡ Test exempted - status