 the collection.
<li><p>A user-specified comparer will not be called by <b>EqualConstraint</b>
    if either or both arguments are null. If both are null, the Constraint
	succeeds. If only one is null, it fails.
<li><p>NUnit has special semantics for comparing <b>Streams</b> and
<b>DirectoryInfos</b>. For a <b>Stream</b>, the contents are compared.
For a <b>DirectoryInfo</b>, the first-level directory contents are compared.
</ol>

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