title: What's the purpose of the Tuple(T1)/Singleton in .net?
body: <p>One of the Tuple Types in .net 4 is a <a href="http://msdn.microsoft.com/en-us/library/dd384265.aspx" rel="noreferrer">Single-Element Tuple</a>. I just wonder what the purpose of this struct is?</p>
  
  <p>The only use I saw is when using in the <a href="http://msdn.microsoft.com/en-us/library/dd383325.aspx" rel="noreferrer">8+ Tuple</a> as it can be assigned to TRest, where it actually makes sense. Is that it? Or is there any other purpose?</p>