+1 <div><br></div><div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">&gt; I&#39;d prefer to not wait with adding popCount until this is done, unless<br>


&gt; someone takes it on them to add the others before GHC 7.4.<br>
<br>
</div>No, don&#39;t wait. While it would be nice to have the others equally soon,<br>
it&#39;s better to have one goody than none.<br></blockquote><div><br></div><div>How about making the API change in one go -- i.e. add the default implementations for all of them, which is easy.  Then people can come along and do the GHC work necessary to make the others efficient later.  </div>

<div><br></div><div>In fact, changing the API could be a &quot;forcing function&quot; to make the others happen ;-).</div><div><br></div><div> -Ryan</div><div><br></div></div></div>