Puck disconnecting after running function from the browser without passing a callback.

@Gordon is there a reason why the connection doesn't have an eval function? E.g.

Puck.connect(conn => {
    conn.eval('Puck.getBatteryPercentage()', console.log);
});

When I run this I get conn.eval is not a function. I have tried using Puck.eval but it then asks me to reconnect the Puck again.