Missing Multimap methods?

[danieldietrich]

Map has these, Multimap not:

<U extends V> Map<K, V> put(K key, U value, BiFunction<? super V, ? super U, ? extends V> merge);

<U extends V> Map<K, V> put(Tuple2<? extends K, U> entry, BiFunction<? super V, ? super U, ? extends V> merge);

default Function1<K, Option<V>> lift() {
    return this::get;
}

default Function1<K, V> withDefault(Function<? super K, ? extends V> defaultFunction) {
    return k -> get(k).getOrElse(() -> defaultFunction.apply(k));
}

default Function1<K, V> withDefaultValue(V defaultValue) {
    return k -> get(k).getOrElse(defaultValue);
}

[danieldietrich]

Multimap will probably not part of Vavr 1. We want to focus on the most frequently used collections. Maybe we will release some kind of add-on collections package later.