Suggest `cast_signed` and `cast_unsigned` instead of `as`

[ojeda]

What it does

cast_signed and cast_unsigned are stable since 1.87.

They produce the same result as an as cast, but they ensure that the bit-width remains the same.

Thus, for projects that may want to avoid as casts as much as possible, using cast_{un,}signed may be positive.

Advantage

Reduce the need for as casts.

Drawbacks

No response

Example

u32::MAX as i32
-1i32 as u32

Could be written as:

u32::MAX.cast_signed()
(-1i32).cast_unsigned()