Support Borrow

[czipperz]

Borrow is pretty similar to AsRef and thus it would make sense to support it here.

[Artoria2e5]

I'm thinking about doing this and #8 together when I get more time. Anything else in https://doc.rust-lang.org/std/all.html#Traits that might make sense to add?

[llogiq]

Deref and DerefMut come to mind.

[sunfishcode]

Could I suggest AsFd too? Note that it's currently only in Nightly.

[Imberflur]

IntoIterator would be useful

[llogiq]

Could I suggest AsFd too? Note that it's currently only in Nightly.

Likely behind a feature flag.