In the Dumper output in this example, the single-quotes around the nummbers (e.g., $VAR1 = '5601.57') indicate that Perl still sees these scalars as strings

Actually, one has to be very careful with statements like these - there is no reliable way to ask Perl for the difference between e.g. 1 and "1". Although Data::Dumper has some code that tries to peek under the hood, it's not perfect:

use Data::Dumper;
my $str = "1";
print Dumper($str);  # $VAR1 = '1';
my $n = $str + 1;
print Dumper($str);  # $VAR1 = 1;

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Update: Pointed the link above to a better node with more references.

In reply to Re^4: The error says the value is uninitialized, but it works anyway by haukex
in thread The error says the value is uninitialized, but it works anyway by mizducky

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