String/float conversion is not the only problem while dealing with floats. Consider following example: 
perl -e '$x=1/3; $x-=1/2; $x+=1/3; $x-=1/2; $x+=1/3; print $x,"\n"'

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$x should be equal to zero but it isn't.

In reply to Re^3: Fun with floating points by chomzee
in thread Fun with floating points by kikuchiyo

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