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In PR #44 the requrest is to cast the AC::Parameters to a hash. This is not needed, since AC::Parameters has a values call that delegates it to the @parameters variable. The variable is a ActiveSupport::HashWithIndifferentAccess, which has a values method.
So the only thing that needs to be done is extend the conditional to check if the attributes variable is AC::Parameters object.
Another option would be to change the conditional to see of the attributes objec respond_to?(:values)