code: function cloneMatches(words) {
    var result = {}
    var key
    var match
  
    for (key in words) {
      match = words[key]
  
      result[key] = {
        matches: match.matches,
        stem: match.stem,
        score: match.score
      }
    }
  
    return result
  }
docs: Clone the given map of words.  This is a two level-deep clone.