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Mark Gossage wrote:

function printargs(...) table.foreach({...},print) end

It reports that there are in fact two arguments (the table
repeated twice).

Is the manual wrong, or is there a bug in the code?

It looks like this happens because the function Arith in
lvm.c doesn't have a special case for the one unary
arithmetical operator.  This of course is not a problem
unless you write a unary minus metamethod that looks for a
second argument, which you probably shouldn't do.

The Lua team can answer whether they consider this a bug (in
the manual or the implementation).