Remove array ref to reduce code size

[AdamGS]

Build times are basically the same, but the rlib is 3.9MB instead of 5.4MB

[robert3005]

curious why these don't inline to the same thing? Anyway 👍

[codspeed-hq]

Merging this PR will not alter performance

✅ 158 untouched benchmarks
⏩ 123 skipped benchmarks¹

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_{Comparing adamg/remove-array-ref-for-code-size (397d1ff) with develop (5a7cd72)}

Footnotes

1. 123 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[AdamGS]

array_ref! is:

macro_rules! array_ref {
    ($arr:expr, $offset:expr, $len:expr) => {{
        {
            #[inline]
            const unsafe fn as_array<T>(slice: &[T]) -> &[T; $len] {
                &*(slice.as_ptr() as *const [_; $len])
            }
            let offset = $offset;
            let slice = &$arr[offset..offset + $len];
            #[allow(unused_unsafe)]
            unsafe {
                as_array(slice)
            }
        }
    }};
}

and the &$arr[offset..offset + $len]; hides a panic IMO, which makes it more code