With perl 5.8.8 in debian etch using mod_perl in apache, I have the following happening: 
 my $hash = RRDs::info( $datafile );
 my $step = $hash->{'step'};
A string of '300' is returned. When used in: 
my $mid = $lupdate % $step ;
I get an 'Illegal modulus zero' error. It is as though the string of '300' is not being converted to numeric. Yet if I 
my $step = '300';
The '%' will operator will work as expected. Am I missing something with the RRDs library? Some taint mode or something?

In reply to implicit numeric conversion isn't by stargrazer

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