title: What is ARR_WORDS in a GHC heap profile?
body: <p>The heap profile for my program, generated by <code>./program +RTS -hy -p</code>, is dominated by "ARR_WORDS". It doesn't correspond to anything obvious in my program; is it a GHC internal of some sort? How should I treat its dominating appearance in the profile?</p>
  
  <p>I'm using GHC 7.0.3.</p>