[SDRuby] what does * mean in Foo.to_json(*a)

[misham]

I'm looking at the code at http://flori.github.com/json/  and the
example given is:

class Range
  def to_json(*a)
    {
      'json_class'   => self.class.name,
      'data'         => [ first, last, exclude_end? ]
    }.to_json(*a)
  end

  def self.json_create(o)
    new(*o['data'])
  end
end


What does *a mean in the to_json function parameter list?

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