Guarantee Utf16 output

[Plecra]

It'd be handy to have a type that guaranteed the encoding like str does. There could be an optional dependency on something like widestring, or just a very simple wrapper type that users can write conversions for.

pub struct Utf16([u16]);
impl Utf16 {
    pub unsafe fn from_utf16_unchecked(utf16: &[u16]) -> &Self;
    pub fn as_wide(&self) -> &[u16];
}

[Lokathor]

I'm not sure if a proc-macro crate can export non-proc-macro items.

If it can, i'd accept some sort of PR for this being an optional thing.

[Lokathor]

oh but this would probably work in v2!