Hi,

the operator replay seems not able to serve more than one subscription. The output of the following code

        auto cob = rxcpp::rxs::from(1, 2, 3)
            .tap([](int v) {cout << "tap: " << v << endl; })
            .replay()
            .ref_count()
            ;
        cob.subscribe([](int v) {cout << "subscribe A: " << v << endl; });
        cob.subscribe([](int v) {cout << "subscribe B: " << v << endl; });

is like this

tap: 1
subscribe A: 1
tap: 2
subscribe A: 2
tap: 3
subscribe A: 3

I.e. The second subscription is never called.

Running similar code using Rx.NET outputs the followings:

tap: 1
subscribe A: 1
tap: 2
subscribe A: 2
tap: 3
subscribe A: 3
subscribe B: 1
subscribe B: 2
subscribe B: 3