From a report by a beta tester 8 years ago: kicking a chest gave
"THUD! The chest explodes!" but the chest remained intact. The
explosion was destroying all floor items at the hero's spot rather
than at the chest's spot. Fixing that results in the chest being
destroyed because it's one of the items at its own spot.
While fixing that I noticed that delobj() was only protecting the
Amulet and the invocation items from destruction, not Rider corpses.
You could destroy one or more of those by getting a trapped chest's
explosion while using a key at its spot rather than by kicking it
from adjacent. (Getting the exploding chest result is not easy,
particuarly with positive luck. I eventually resorted to forcing
it with a debugger.)
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