Anyone know about Time#round in 1.9. Apparently it exists but it seems
to do nothing but eat up cpu cycles.

  ruby-1.9.2-p0 > t = Time.new
   => 2010-08-30 14:34:03 -0400
  ruby-1.9.2-p0 > t.round(100000)
   => 2010-08-30 14:34:03 -0400
  ruby-1.9.2-p0 > t.round(1000000)
   => 2010-08-30 14:34:03 -0400