function forEachAccumulated(arr, cb, scope) {
	  if (Array.isArray(arr)) {
	    arr.forEach(cb, scope);
	  } else if (arr) {
	    cb.call(scope, arr);
	  }
	}
@param {array} arr an "accumulation" of items which is either an Array or
a single item. Useful when paired with the `accumulate` module. This is a
simple utility that allows us to reason about a collection of items, but
handling the case when there is exactly one item (and we do not need to
allocate an array).