lass="container content-grid">
  <div class="description">
    <div class="abstract content">
      Creates a MiddlewareReader that combines multiple readers into one, as long as they depend on same environment. Once this environment is injected, upstream readers will run and the result will be a tuple containing the resulting values of each upstream reader. Then you provide a way to combine there resulting Middlewares into one.
    </div>
  </div>
  
  <!-- The sidebar once we have one: <div class="summary