in reply to Retrieve value with key warns 'unitialized value' although present
Whitespace! Your keys all have an extra space at the end, since you split on /=/. To fix, change your split to /\s*=\s*/. As a tip, when printing debug statements, use obvious delimiters to catch this kind of error. For example:
while ( (my $key, my $value) = each %config ) { print "!$key! => ($value)\n"; }
print map{substr'hark, suPerJacent other l',$_,1}(11,7,6,16,5,1,15,18..23,8..10,24,17,0,12,13,3,14,2,4);
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