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  $odVal = defined $odVal ? $odVal : 0;
  $osVal = defined $osVal ? $osVal : 0;

  $odVal //= 0;
  $osVal //= 0;

my ( $FH, $orderKey, $odVal, $osVal ) = map $_ || 0, @_[ 0 .. 3 ];

my ( $FH, $orderKey, $odVal, $osVal ) = map defined $_ ? $_ : 0, @_[ 0
+ .. 3 ];