LINQ in sets of

Thanks to this Stackoverflow answer for showing how to easily return LINQ results in sets:

public static IEnumerable<T[]> InSetsOf<T>(this IEnumerable<T> source, int max) {
    List<T> toReturn = new List<T>(max);
    foreach (var item in source) {
        if (toReturn.Count == max) {
            yield return toReturn.ToArray();
            toReturn = new List<T>(max);
    if (toReturn.Any()) {
        yield return toReturn.ToArray();


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