public static HMap <K, V> setItem <K, V>(HMap <K, V> map, K key, Func <V, V> mapper) => map.SetItem(key, mapper);
public static HMap <K, V> setItem <K, V>(HMap <K, V> map, K key, V value) => map.SetItem(key, value);
public static HMap <K, V> setItem <K, V>(HMap <K, V> map, K key, Func <V, V> mapper) => map.SetItem(key, mapper);
public static HMap <K, V> setItem <K, V>(HMap <K, V> map, K key, V value) => map.SetItem(key, value);