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  1. or download this
    $fp1 =  1.9041105342991877e+258;;

...
 -2.1337646185215534e+242                                  ## A change
+ straight away!                      ### 2 ###

##### Note that whilst the sign of the change at ### 1 ### & ### 2 ###
+ is different, the absolute value is the same.
  2. or download this
    $fp2 =  -8.2727285363069939e-293;;
printf "% 25.17g\n", $fp2;;
 -7.9999999999999948e-293                          ### WTF? ###