title: Why Tuple's items are ReadOnly?
body: <p>I was thinking to use <code>Tuple</code> class to store 2 integer information (StartAddress, EndAddress) I need in my program.</p>
  
  <p>But I discover that <code>Tuple</code> items are ReadOnly, so if I need to set a value for an item, I need to re-instantiate a Tuple.</p>
  
  <p>What is the reason behind this design decision?</p>