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

##</code><code>##

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

##</code><code>##

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

##</code><code>##

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