code: function(all) {
        var result = [];
        arrayEach(this, function(el, i) {
          if(isArray(el)) {
            result.push(el.compact());
          } else if(all && el) {
            result.push(el);
          } else if(!all && el != null && el.valueOf() === el.valueOf()) {
            result.push(el);
          }
        });
        return result;
      }
docs: *
  @method compact([all] = false)
  @returns Array
  @short Removes all instances of %undefined%, %null%, and %NaN% from the array.
  @extra If [all] is %true%, all "falsy" elements will be removed. This includes empty strings, 0, and false.
  @example
  
  [1,null,2,undefined,3].compact() -> [1,2,3]
  [1,'',2,false,3].compact()       -> [1,'',2,false,3]
  [1,'',2,false,3].compact(true)   -> [1,2,3]
  
  *