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    if (@{$self->{queue}} == 1) {
        if ($self->{do_batch}) {
            # Schedule next tick, to allow all batch calls this frame to be batched
            # together.

            # We prefer an idle watcher as it will execute after all Promises are
            # resolved (batching as much as possible). But Mojo::IOLoop's API does
            # not provide this. And we cannot assume AnyEvent can be used.
            # The best we can do is detect the EV backend and use EV::idle.
            if (Mojo::IOLoop->singleton->reactor->isa('Mojo::Reactor::EV')) {
                # Capture the lexical inside the coderef to keep it alive until
                # the callback is finished.
                my $w; $w = EV::idle(sub {
                    $self->_dispatch_queue;
                    undef $w;
                });
            }
            else {
                # We fall back to next_tick, which is less efficient.
                Mojo::IOLoop->next_tick(sub { $self->_dispatch_queue });
            }