Do not require a matching empty array when finding duplicates.
--- a/spec/latest/json-ld-api/alternate2.html Sun Feb 10 14:20:21 2013 -0500
+++ b/spec/latest/json-ld-api/alternate2.html Sun Feb 10 14:40:47 2013 -0500
@@ -3929,8 +3929,7 @@
the <tref>property generator</tref> <em>value</em>.
</li>
<li>
- If both <em>prospects</em> and <em>value</em> are empty
- <tref title="array">arrays</tref>:
+ If <em>value</em> is an empty <tref>array</tref>:
<ol class="algorithm">
<li>
Set <em>result</em> to <tref>true</tref>.