Accessing array elements without bounds check. (from https://stackoverflow.com/a/66962968/921054)

ArrayExtensions.cs

public static class ArrayExtensions
{
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static ref T At<T>(this T[] array, int index)
	{
		ref T tableRef = ref MemoryMarshal.GetArrayDataReference(array);
		return ref Unsafe.Add(ref tableRef, (nint)index);
	}
}