debug.traceback() oddity

[David Given <dg@...>]

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[Resend, as the original message doesn't seem to have shown up --- are
there mailing list server issues?]

I'm trying to use the level parameter described in the docs for
debug.traceback(). However, I'm finding that it doesn't appear to work
as described. For example:

> =debug.traceback()
stack traceback:
	stdin:1: in main chunk
	[C]: ?

...works as expected. But this:

> =debug.traceback(nil, "foo", 1)
1

...doesn't. Experimentation reveals that:

> =debug.traceback("foo", "bar", "baz", "boo")
foobarbazboo
stack traceback:
	stdin:1: in main chunk
	[C]: ?

...which is very odd; it appears that all the parameters are getting
concatenated together and become the message.

What am I missing here?

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