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# set up default values for parameters:
my %pars = (
...
) or die "bad GetOptions $!";

# use $pars{item}, which is unaffected by an --items argument

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my @opts = (
    { name => 'item1', type => '=s', dval => 'default_value1' },
...
     @args
) or die "bad GetOptions $!";