class ActiveSupport::Callbacks::CallbackSequence

def initialize(nested = nil, call_template = nil, user_conditions = nil)

:nodoc:
https://github.com/rails/rails/issues/18011
chaining them with nested lambda calls, see:
Execute before and after filters in a sequence instead of 
def initialize(nested = nil, call_template = nil, user_conditions = nil)
  @nested = nested
  @call_template = call_template
  @user_conditions = user_conditions
  @before = []
  @after = []
end