@Nonnull
    @SafeVarargs
    static <S extends Event> MergedSubscriptionBuilder<S> newBuilder(@Nonnull Class<S> superClass, @Nonnull Class<? extends S>... eventClasses) {
        return newBuilder(superClass, EventPriority.NORMAL, eventClasses);
    }
Makes a MergedHandlerBuilder for a super event class

@param superClass   the abstract super event class
@param eventClasses the event classes to be bound to
@param <S>          the super class type
@return a {@link MergedSubscriptionBuilder} to construct the event handler
helper/src/main/java/me/lucko/helper/event/functional/merged/MergedSubscriptionBuilder.java