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  It will recognize JSON::PP::Boolean and boolean.pm objects and dump them
  correctly.
  
  Numbers which also have a C<PV> flag will be recognized as numbers and not
  as strings:
  
      my $int = 23;
      say "int: $int"; # $int will now also have a PV flag
  
  That means that if you accidentally use a string in numeric context, it will
  also be recognized as a number:
  
      my $string = "23";
      my $something = $string + 0;
      print $yp->dump_string($string);
      # will be emitted as an integer without quotes!
  
  The layout is like libyaml output:
  
      key: