title: Immutable collections?
body: <p>I am making most of my basic types in my app, immutable. But should the collections be immutable too? To me, this seems like a huge overhead unless I am missing something.</p>
  
  <p>I am talking about collections to hold Point3 values, etc which can be added as it goes at different times. So if there are 1M values in a collection, and you needed to delete 1 of them, you would have to create the same collection all over again, right?</p>