ActionCable: CreateMixin excess properties can be any type. (#39418)
ActionCable: CreateMixin excess properties can be any type. (#39418)

ActionCable.CreateMixin acts as, literally, a class mixin, thus, its properties can be anything.

See: https://github.com/rails/rails/blob/master/actioncable/app/assets/javascripts/action_cable.js#L328-L336
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