Make the suggested change that only adjusting something into its own
slot be the way to collect/merge compatible stacks with it, instead
of any #adjust without a split count. This removes the previous
special case for a count that matches the stack size. Having to
know the exact count was not a burden on the player, but being able
to move things around without merging with other stacks makes more
sense than the original behavior or the hack to work-around that
behavior.
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