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1393eac44c
Fixed regression caused in 1.2.3 due to fix from 🎫`4181` where the changes to the event system involving :class:`.Engine` and :class:`.OptionEngine` did not accommodate for event removals, which would raise an ``AttributeError`` when invoked at the class level. Change-Id: I1c9083829d74dd710716d28b0eaca4fa15e86313 Fixes: #4190