fCraft.PlayerEnumerable.RankedAtMost C# (CSharp) Method

        public static IEnumerable<Player> RankedAtMost([NotNull] this IEnumerable<Player> source,
                                                       [NotNull] Rank maxRank) {
            if (source == null) throw new ArgumentNullException("source");
            if (maxRank == null) throw new ArgumentNullException("maxRank");
            foreach (Player player in source) {
                if (player.Info.Rank <= maxRank) {
                    yield return player;
                }
            }
        }