static bool All <TSource>(this ReadOnlySpan <TSource> source, Func <TSource, int, bool> predicate) => source.AllAt(new FunctionWrapper <TSource, int, bool>(predicate));
static bool All <TSource>(this ReadOnlySpan <TSource> source, Func <TSource, int, bool> predicate) => source.AllAt(new FunctionWrapper <TSource, int, bool>(predicate));