}
	if match, ok := a.keyedItems[key]; ok {
		return match
	}
	// keep keying items until we either find a match or run out of unkeyed items
	for len(a.unkeyedItems) > 0 {
		// dequeue an unkeyed item
		item := a.unkeyedItems[0]
		a.unkeyedItems = a.unkeyedItems[1:]

		// key the item
		mitem, ok := item.(map[string]interface{})
		if !ok {
			continue
		}
		itemKey, ok := a.ks.CompositeKeyFor(mitem)