/// <summary>
/// Shifts a subset of an array of items in place.
/// </summary>
public static void Shift <T>(this T[] array, int offset, int from, int to)
{
offset = SlurMath.RepeatPos(offset, to - from);
Reverse(array, from, from + offset);
Reverse(array, from + offset, to);
Reverse(array, from, to);
}