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Argument "$VAR1 = '-39.99994';\n" isn't numeric ...

$VAR1 = '-39.99994';\n

print Dumper \%some_hash;

#!/usr/bin/env perl -l

...
my $val2 = -39.9999400000;
print $val2;
print "Number in a string >>> $val2 <<<";

-39.9999400000
-99.99985
-39.99994
Number in a string >>> -39.99994 <<<