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                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Transforms any subscriber into a Unfailable subscriber with the same element type. After calling this method, a subscriber will be derived
and it won&rsquo;t accept publishers that can fail.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declarat