title: When do I need to use a Bigarray and why?
body: <p>The documentation on the Bigarray module is somewhat vague.  It states that the purpose of arrays in that module is to hold "large arrays", but it doesn't really define what it means by "large array".  When should I use a Bigarray over a regular array?  Is there a certain number of elements beyond which I should just use a Bigarray?  Is it in the thousands?  Millions?  Billions?</p>
  
  <p>And what makes a Bigarray better at dealing with big arrays?  What makes a regular array better at dealing with... non-big arrays?</p>