The values of this.
The values are iterated in the order of their corresponding keys.
This means that iterating keys and values in parallel will
provided matching pairs of keys and values.
The returned iterable has an efficient length method based on the
length of the map. Its Iterable.contains method is based on
== comparison.
Modifying the map while iterating the values may break the iteration.
Source
Iterable<V> get values => new _SplayTreeValueIterable<K, V>(this);