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[path]
files=foo.txt,bar.txt,baz.csv

@files = split /\s*,\s*/, $config->{path}{files};
 # the \s* removes the optional whitespace around delimiters

foreach my $Section (values %$config) {
 # $Section is a hash ref containing the values of the section, not th
+e section name!
...
    $Section->{$value} = [split /\s*,\s*/, $Section->{$value}];
  }
}