The "slack" option simply searches from the end of the block backwards
to the last non-zero byte, and sets that position as the "compressed"
size.
This patch is highly experimental; please see the associated PR for
discussion.
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.