Simple way of turning off observers during rake task?

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Rails 3.1 finally comes with API for this:
http://api.rubyonrails.org/v3.1.0/classes/ActiveModel/ObserverArray.html#method-i-disable

ORM.observers.disable :user_observer
  # => disables the UserObserver

User.observers.disable AuditTrail
  # => disables the AuditTrail observer for User notifications.
  #    Other models will still notify the AuditTrail observer.

ORM.observers.disable :observer_1, :observer_2
  # => disables Observer1 and Observer2 for all models.

ORM.observers.disable :all
  # => disables all observers for all models.

User.observers.disable :all do
  # all user observers are disabled for
  # just the duration of the block
end

Where ORM could for example be ActiveRecord::Base

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