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  1. or download this
      push( @{$ref2array}, sort( keys( %{$obj->things()} ) ) );
  2. or download this
      map {
    push( @{$ref2array}, $_ )
  } ( sort( keys( %{$obj->things() } );
  3. or download this
      foreach ( sort( keys( %{$obj->things} ) ) ) {
    push( @{$ref2array}, $_ );
  }
  4. or download this
      push(
    @{$ref2array},
    map { uc($_) } ( sort( keys( %{$obj->things()} ) ) )
  );
  5. or download this
      my @uppercasekeys;
  foreach ( sort( keys( %{$obj->things()} ) ) ) {
    push( @uppercasekeys, uc( $_ ) );
  }
  push( @{$ref2array}, @uppercasekeys );