class Async::Idler

@parameter parent [Interface(:async) | Nil] The parent task to use for async operations.
@parameter backoff [Numeric] The initial backoff time, used for delaying work.
@parameter maximum_load [Numeric] The maximum load before we start shedding work.

@public Since `stable-v2`.
Create a new idler.

def initialize(maximum_load = 0.8, backoff: 0.01, parent: nil)
	@maximum_load = maximum_load
	@backoff = backoff
	@parent = parent
end