title: Applying [AutoFixture] SemanticComparison OfLikeness to sequences / collections / arrays / IEnumerable
body: <p>We have written a test which looks like the following. This test requires that we have created en <code>Equal</code>-overload for the <code>CodeTableItem</code>-class:</p>
  
  <pre><code>ICollection&lt;CodeTableItem&gt; expectedValutaList = new List&lt;CodeTableItem&gt;();
  expectedValutaList.Add(new CodeTableItem("DKK", "DKK"));
  expectedValutaList.Add(new CodeTableItem("EUR", "EUR"));
  RepoDac target = new RepoDac(); 
  
  var actual = target.GetValutaKd();
  
  CollectionAssert.AreEqual(expectedValutaList.ToList(),actual.ToList());
  </code></pre>
  
  <p>The test works fine, but has the unfortunate dependency to the <code>Equality</code>-function, meaning if I extend the <code>CodeTableItem</code>-class with one more field, and forgets to extend the <code>Equals</code>-function, the unit test still runs green, although we do not test for all fields. We want to avoid this <code>Equality</code> pollution (see <a href="http://xunitpatterns.com/test-specific%20equality.html" rel="noreferrer">Test Specific Equality</a>), which has been written only  to conform to the test.</p>
  
  <p>We have tried using <code>OfLikeness</code>, and have rewritten the test in this way:</p>
  
  <pre><code>ICollection&lt;CodeTableItem&gt; expectedValutaList = new List&lt;CodeTableItem&gt;();
  expectedValutaList.Add(new CodeTableItem("DKK", "DKK"));
  expectedValutaList.Add(new CodeTableItem("EUR", "EUR"));
  var expectedValutaListWithLikeness = 
            expectedValutaList.AsSource().OfLikeness&lt;List&lt;CodeTableItem&gt;&gt;();
  
  RepoDac target = new RepoDac(); 
  ICollection&lt;CodeTableItem&gt; actual;
  
  actual = target.GetValutaKd();
  
  expectedValutaListWithLikeness.ShouldEqual(actual.ToList());
  </code></pre>
  
  <p>But the test fails because the <code>Capacity</code> is not equal. I have written code that runs through reflection many times, and typically ended up implementing overloads for ignoring fields. Is there a way to ignore certain fields with the <code>OfLikeness</code> or <code>ShouldEqual</code>? Or is there some other way of solving this issue?</p>