Noticed when testing boulder pushing into/out of shops yesterday:
a shopkeeper can "mutter incantations" and fracture a boulder in the
shop, transforming it to rocks. If hero owed shk for the boulder
(happens when it has been further inside the shop and then gets pushed
to the shop's free spot), it would disappear from the shop's bill and
hero would then owe for the resulting rocks (which cost more than the
boulder!). That seemed confusing, especially since neither Iu nor Ix
would show the rocks (which are on the floor rather than in invent;
the $ command reported the amount owed, but not what the item was).
When such fracturing happens move the boulder from the unpaid section
of the shop bill to the used-up section before creating the rocks,
which are no longer interesting.
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