From a reddit thread: statue weight is one and half times corpse
weight and some monsters that don't leave a corpse are defined as
having mons[].cwt==0 so statues of those weighed nothing.
Rather than assigning a non-zero corpse weight to every type of
creature, statues that weigh less than an arbitrary value based on
monster size have their weight increased to that value. The weight
of a statue of a killer bee jumps from 1 to 100, that of a leprechaun
increases from 90 to 100, that of a yellow light is changed from 0
to 300, wraith from 0 to 500, and air elemental from 0 to 900. That
last one is actually too low but making the formula more complex
doesn't seem worth it.
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