internal AsyncValueEnumerable(IAsyncValueEnumerable <TSource, TEnumerator> source) => this.source = source;
public static AsyncValueEnumerable <TEnumerator, TSource> AsAsyncValueEnumerable <TEnumerator, TSource>(this IAsyncValueEnumerable <TSource, TEnumerator> source) where TEnumerator : struct, IAsyncEnumerator <TSource> => new(source);