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	Uses POSIX shell parameter expansion syntax.
    <pragma-> !factadd cookie /me gives a cookie to ${args:-nobody. What a shame}!
       <PBot> cookie added to the global channel.
    <pragma-> !cookie Bob
            * PBot gives a cookie to Bob!
    <pragma-> !cookie
            * PBot gives a cookie to nobody. What a shame!
    <pragma-> !factadd sum /call calc $arg[0]:-1 + $arg[1]:-2
       <PBot> sum added to the global channel.
    <pragma-> !sum
       <PBot> 1 + 2 = 3
    <pragma-> !sum 3
       <PBot> 3 + 2 = 5
    <pragma-> !sum 4 6
       <PBot> 4 + 6 = 10