Support for the Ruby 2.4 series has ended. See here for reference.
A leveled notifier is comparable to the composite group from CompositeNotifier#notifiers.
Create a new leveled notifier with the given base, and prefix to send to AbstractNotifier.new
The given level is used to compare other leveled notifiers in the CompositeNotifier group to determine whether or not to output notifications.
# File irb/notifier.rb, line 186
def initialize(base, level, prefix)
super(prefix, base)
@level = level
end