a.keyedItems[itemKey] = mitem
		}

		// if it matches, short-circuit
		if itemKey == key {
			return mitem
		}
	}

	return nil
}

func makeKeyStrategy(sts Schema) keyStrategy {
	listMapKeys := sts.XListMapKeys()
	if len(listMapKeys) == 1 {
		key := listMapKeys[0]
		return &singleKeyStrategy{
			key: key,
		}
	}

	return &multiKeyStrategy{