I think the BF stuff is exactly the same. But for piecestore the data got moved to the files/config/storage/trash subfolders for a week. And hashstore simply flags it as deleted in the database… and then eventually, based on probability and how much other trash is in a data log file… and if the planets align and Mercury is in retrograde… the data log file will be compacted - basically rewritten without the trash.
But if I have that wrong someone will correct me…