From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904184#15
I wonder if the "use_all" part of the patch shouldn't be its own debconf question though. It appears to be useful to tell partman-auto (in general, not just the partman-auto-lvm part) to _not_ use all available space (though I'm not sure if other parts of partman-auto actually use all space or not).
I think that's talking about this code: https://salsa.debian.org/installer-team/partman-auto-lvm/-/blob/1177909ee2f3bbe2b4f53e59076c6e8af9d5029e/perform_recipe_by_lvm#L135-181
If there were a debconf question for that use_all variable, I think that would accomplish the same thing as having a free space partition type. (I don't know which way is better, just mentioning it as an option.)
