How to clear an IntervalHeap for re-use?

[mastef]

It would be nice to be able to clear an IntervalHeap for re-use, to reduce array allocs and to avoid GC.

Currently ( if I understood correctly ) it can be only cleared with running either while (!iHeap.IsEmpty) iHeap.DeleteMin(); or while (!iHeap.IsEmpty) iHeap.DeleteMax();, which seems less than optimal performance wise.

A iHeap.Clear() method could Array.Clear(heap, 0, size); and then set size = 0

[mastef]

I've been testing now with this, and it seems to work nicely. It reduced a lot of GC by allowing to re-use interval heaps without having to create a new one:

public void Clear()
{
	stamp++;
	
	for (int i = 0; i < size; i++)
	{
		heap[i].first = default;
		heap[i].firsthandle = null;
		heap[i].last = default;
		heap[i].lasthandle = null;
	}
	
	size = 0;
}

( Using DeleteMin() in a loop was way too slow. )