Errors.merge! chokes on symbolic errors with options

[tfausak]

class Interaction < ActiveInteraction::Base
  boolean :a_boolean
end
interaction = Interaction.new
interaction.errors.add_sym(:a_boolean, :invalid_type, type: :boolean)
errors = ActiveInteraction::Errors.new(interaction)
errors.merge!(interaction.errors)
# I18n::MissingInterpolationArgument: missing interpolation argument :type in "is not a valid %{type}" ({:model=>"Interaction", :attribute=>"A boolean", :value=>nil} given)