[plt-scheme] Should < work with just one argument?

    $ mzscheme
    Welcome to MzScheme version 299.102, Copyright (c) 2004-2005 PLT Scheme, Inc.
    > (< 3 4)
    #t
    > (< 3)
    <: expects at least 2 arguments, given 1: 3
    > 

R5RS says

         - procedure: < x1 x2 x3 ...
and
         <thing1> <thing2> ...

        indicates one or more occurrences of a <thing>.

So I read R5RS as saying that the procedure < should accept one or
more arguments, but mzscheme's < seems to demand two.  Is this a bug?

-- 
Always code as if the guy who ends up maintaining your code will
    be a violent psychopath who knows where you live.  John F. Woods