// console.Debugf("compacting %v, removing %d children\n", candidate, removing)

		flat.Compacted = true
		d.deleteRecursive(candidate)
		d.replaceHashed(candidate, nil, *flat)

		// Remove top entry and subtract removed children.
		remove -= removing
		leaves = leaves[1:]
	}
}

// forceCompact will force compact the cache of the top entry.
// If the number of children is more than limit*100, it will compact self.