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sub xxx : Local Args(0) {
    my ($self, $c, $s, $r, $p) = @_;
    $c->res->body( wantarray );
}

sub xxx : Local Args(0) {
    my ($self, $c) = @_;
    function_in_void_context();
...
    # Naked function calls in Cat is code smell.
    $c->res->body("Value or none if falling back to template, etc");
}