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    $ perl -e 'printf "%2.4g\n", 23.05'
    23.05
    $ perl -e 'printf "%2.4g\n", 23.00'
    23

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    g    The  double  argument  is converted in style f or e
         (or E for G conversions).  
...
         Trailing zeros are removed from the fractional part
         of  the result;
         ...