- * The size of the cluster is only to be trusted in the first block of the cluster.
- * If the cluster results of the fusion of several clusters, the previously first
- * block of their cluster will have partial data. The only information kept consistent over
- * all blocks of the clusters is their type (== -1).
- *
- * Note that there is no way to determine if the block is free or busy by exploring
- * this structure only. It wasn't intended to be crawled for comparison and we should fix it (TODO).