<p>So... some of the doFoo() primitives clearly could do without the second expansion at the end, but at least these seem to require it:</p>
<ul>
<li>expand (obviously)</li>
<li>uncompress</li>
<li>P and S</li>
</ul>
<p>As for uncompress, what it really needs is expansion of the uncompressor command (ie the '%__bzip -cd' part) <em>without</em> expanding the argument for the second time.</p>

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