Seems like the simplest case isn't working here!

[mycpuorg]

I love the idea of this library. I would prefer to use it but the following simple usecase fails in unexpected ways:

pipes::mux(tags, res) >>= pipes::filter([&](auto t, auto r) { return (t == 'b');})
       >>= pipes::unzip(pipes::push_back(bs), pipes::push_back(rs));

Godbolt Link here