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my @ary = ("a","b","c");
sub foo($;$$) { print Dumper(\@_) }
sub foo2      { print Dumper(\@_) }
foo (@ary, ("x","y"), "z"); # @_ is [3, 'y', 'z' ]
foo2(@ary, ("x","y"), "z"); # @_ is ['a', 'b', 'c', 'x', 'y', 'z']