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do you know what this should do?
(FORMAT NIL "~-1%")
1. "It is an error."
2. "Crank up the monitor's voltage and send a lethal blast of X-rays
into the face of the person issuing such a silly command."
Since not all machines can support solution 2, we should probably go
with 1, even though 2 is the more elegant and long-lasting solution.
But seriously, there seem to be a number of places in the format
directives where negative numbers would make no sense. I don't think
that all of these are explicitly flagged. This should probably be fixed
up in the standard, but until then it seems reasonable to assume
non-negative integers unless there's some obvious meaning for the