<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Oct 1, 2008, at 4:41 PM, Rémi Forax wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">I drop an argument but in term of signature, i add a new parameter type.</font></p> </blockquote></div><br><div>The joys of contravariance. The MHs API takes a certain directional point of view which could be consistently reversed, but I think either choice would have led to confusion. Sometimes reasoning about it feels like writing in a mirror.</div><div><br></div><div>-- John</div></body></html>