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$menu_hash{1}{sub}->({
    %{$menu_hash{1}{args}},      # default arguments/values
    ifc_default => 'overridden', # override default value
    ifc_color => 'green',        # add an argument/value
});

"1" => sub { get_ifc_name({'ifc_default' => 'test_me', %{shift} }) },

$menu_hash{1}->({ifc_default => 'overridden', color => 'green'});