Handlers obsolete code

[barakbbn]

In the Handlers namespace, in HandlerBase and HandlerExtesnions
there seems to be code marked as Obsolete:

[Obsolete]
internal static class HandlerExtensions

HandlerBase<E, H>
{
[Obsolete]
internal Func<Event<E>, bool> Predicate { get; set; }
...


Is there an alternative to the obsolete functionality?
Especially since it seems to provide some great power in working with
handlers.

Thanks