allowNullable?

[JakenVeina]

What on earth is the purpose of a throwaway params argument here?

/// <summary>Subscribes nullable reference callbacks with downstream exception protection from static-call syntax.</summary>
/// <param name="source">The source sequence.</param>
/// <param name="onNext">The action to invoke for each value.</param>
/// <param name="onError">The action to invoke for an error.</param>
/// <param name="allowNullable">Reserved for nullable overload resolution.</param>
/// <typeparam name="T">The non-nullable reference value type.</typeparam>
/// <returns>A disposable that cancels the subscription.</returns>
/// <exception cref="ArgumentNullException">A required argument is <see langword="null"/>.</exception>
[System.Runtime.CompilerServices.OverloadResolutionPriority(1)]
public static IDisposable SubscribeSafe<T>(
        IObservable<T?> source,
        Action<T> onNext,
        Action<Exception> onError,
        params bool[] allowNullable)
    where T : class

"Reserved for nullable overload resolution" doesn't really explain anything. This is not a pattern I've ever seen before.