s library to make life easier for future authors wishing to
        contribute. We'll assume the function returns a single floating-point result,
        and takes two floating-point arguments. For the sake of exposition we'll
        give the function the name <em class="replaceable"><code>my_special</code></em>.
      </p>
<p>
        Normally, the implementation of such a function is split into two layers
        - a public user layer, and an internal implementation layer that does the
        actual wor