In 3.4.3, reading an uncursed scroll of enchant armor while wearing
a piece of cursed armor performed an uncurse as well as raising
enchantment. A fairly big patch to redo how pending shop bills were
affected by altering the items on the bill accidentally took away
the uncurse part when modifying the scroll code to use the bless()/
uncurse()/curse() functions instead of manipulating the armor's
blessed and cursed flags directly.
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