   <span class="comment">//</span>
   <span class="comment">// The type of the policy to forward to the actual implementation.</span>
   <span class="comment">// We disable promotion of float and double as that's [possibly]</span>
   <span class="comment">// happened already in the line above.  Also reset to the default</span>
   <span class="comment">// any policies we don't use (reduces code bloat if we're called</span>
   <span class="comment">// multiple times with differing policies we don't actually u