Is `LengthAtMost32` really needed in `AsRef/AsMut` impls for array?

[burrbull]

https://doc.rust-lang.org/src/core/array/mod.rs.html#105

What if just remove this constraint in these implementations?

Can this break something?

Same for Borrow.

[jonas-schievink]

See #61415