/// <summary>
/// Update Deltas window and Recents for value of current byte.
/// </summary>
/// <param name="src">Source buffer.</param>
/// <param name="position">Position in source buffer.</param>
/// <param name="window">Deltas window.</param>
/// <param name="recents">Recents buffer.</param>
static void Remember(
ReadOnlySpan <byte> src,
int position,
ref RevolvingBufferTracker <int> window,
Span <int> recents)
{
// Updates both Recents and Window.
var value = src[position];
var recent = recents[value] - 1;
recents[value] = position + 1;
window.Push(recent);
}
