"text/vnd.motorola.reflex",
				"text/vnd.ms-mediapackage",
				"text/vnd.net2phone.commcenter.command",
				"text/vnd.si.uricatalogue",
				"text/vnd.sun.j2me.app-descriptor",
				"text/vnd.trolltech.linguist",
				"text/vnd.wap.si",
				"text/vnd.wap.sl",
				"text/vnd.wap.wml",
				"text/vnd.wap.wmlscript",
				"text/x-awk",
				"text/x-basic",
				"text/x-c++hdr",
				"text/x-c++src",

These conversions may change the representation of <code>x</code>
and incur a run-time cost.
All other conversions only change the type but not the representation
of <code>x</code>.
</p>

<p>
There is no linguistic mechanism to convert between pointers and integers.
The package <a href="#Package_unsafe"><code>unsafe</code></a>
implements this functionality under restricted circumstances.
</p>