public static bool AddAll <T>( [NotNull, NoEnumeration] this HashSet <T> hashSet, [NotNull, ItemCanBeNull, InstantHandle] params T[] range) => hashSet.AddAll(range.AsEnumerable());
public static bool AddAll <T>( [NotNull, NoEnumeration] this HashSet <T> hashSet, [NotNull, ItemCanBeNull, InstantHandle] params T[] range) => hashSet.AddAll(range.AsEnumerable());