on a script block returned by a build script.</p>
<p><em>Build.ps1</em></p>
<ul>
<li>Fixed search for the build script in the parent tree (it used to stop on a directory with no candidates).</li>
<li>Added yet missing <em>Demo/Wrapper.build.ps1</em> which tests all <em>Build.ps1</em> features.</li>
<li>Documentation comments.</li>
</ul>
<h2>v1.0.31</h2>
<p><code>property</code>: variables with null values are treated as not existing. In other
words, <code>property</code> never gets nulls. There is a little 