/// <summary>
/// Equivalent to <see cref="IMonad{TSource}"/>, but restricted to <see cref="FuncList{T}"/>. Offers LINQ query support with multiple <c>from</c>-clauses.
/// </summary>
/// <typeparam name="TSource">The type of the source's value.</typeparam>
/// <typeparam name="TMiddle">The type of the selector's result.</typeparam>
/// <typeparam name="TResult">The type of the result's value.</typeparam>
/// <param name="source">The source.</param>
/// <param name="f">The function to apply.</param>
/// <param name="resultSelector">The result-selector.</param>
public static FuncList <TResult> SelectMany <TSource, TMiddle, TResult>
(this FuncList <TSource> source,
Func <TSource, FuncList <TMiddle> > f,
Func <TSource, TMiddle, TResult> resultSelector)
=> (FuncList <TResult>)source.Bind(x => (FuncList <TResult>)f(x).Map(y => resultSelector(x, y)));
