public static float Min(this OneItemDefaultEnumerable <float> source)
        {
            if (source.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(source));
            }

            return(default(float));
        }
        public static decimal?Min(this OneItemDefaultEnumerable <decimal?> source)
        {
            if (source.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(source));
            }

            return(default(long?));
        }
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        public static int?Max(this OneItemDefaultEnumerable <int?> source)
        {
            if (source.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(source));
            }

            return(default(int?));
        }
        // double?
        public static double?Average(this OneItemDefaultEnumerable <double?> source)
        {
            if (source.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(source));
            }

            return(default(double?));
        }
        public bool SequenceEqual(OneItemDefaultEnumerable <TItem> second)
        {
            if (IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized("first");
            }
            if (second.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(second));
            }

            return(EqualityComparer <TItem> .Default.Equals(default(TItem), default(TItem)));
        }
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        public bool SequenceEqual(OneItemDefaultEnumerable <TItem> second)
        {
            if (IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized("first");
            }
            if (second.IsDefaultValue())
            {
                throw CommonImplementation.Uninitialized(nameof(second));
            }

            return(false);
        }
 public static System.Collections.Generic.LinkedList <TItem> LinkedList <TItem>(OneItemDefaultEnumerable <TItem> second)
 => LinkedListImpl <TItem, OneItemDefaultEnumerable <TItem>, OneItemDefaultEnumerator <TItem> >(ref second);
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 public static System.Collections.Generic.Stack <TItem> Stack <TItem>(OneItemDefaultEnumerable <TItem> second)
 => StackImpl <TItem, OneItemDefaultEnumerable <TItem>, OneItemDefaultEnumerator <TItem> >(ref second);