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  =item Boolean Handling
  
  You can choose between C<'perl'> (1/'', currently default), C<'JSON::PP'> and
  C<'boolean'>.pm for handling boolean types.  That allows you to dump the data
  structure with one of the JSON modules without losing information about
  booleans.
  
  =item Numbers
  
  Numbers are created as real numbers instead of strings, so that they are
  dumped correctly by modules like L<JSON::PP> or L<JSON::XS>, for example.
  
  =item Complex Keys
  
  Mapping Keys in YAML can be more than just scalars. Of course, you can't load
  that into a native perl structure. The Constructor will stringify those keys
  with L<Data::Dumper> instead of just returning something like
  C<HASH(0x55dc1b5d0178)>.
  
  Example: