Name: partition_select_mode
Type: STRINGLIST
Allowed-Values: random freespace-most freespace-percent-most
 freespace-percent-weighted freespace-percent-weighted-delta
Default-Value: freespace-most
Last-Modified: 2.5.0

Partition selection mode.

*random*
    (pseudo-)random selection

*freespace-most*
    partition with the most free space (KiB)

*freespace-percent-most*
    partition with the most free space (%)

*freespace-percent-weighted*
    each partition is weighted according to its free space (%); the more
    free space the partition has, the more chances it has to be selected

*freespace-percent-weighted-delta*
    each partition is weighted according to its difference of free space
    (%) compared to the most used partition; the more the partition is
    lagging behind the most used partition, the more chances it has to be
    selected

Note that actually even the most used partition has a few chances to be
selected, and those chances increase when other partitions get closer
