Freeze attributes array

lib/mobility/attributes.rb

@@ -133,7 +133,7 @@ def initialize(*attribute_names, method: :accessor, backend: Mobility.default_ba
       raise ArgumentError, "method must be one of: reader, writer, accessor" unless %i[reader writer accessor].include?(method)
       @method = method
       @options = Mobility.default_options.to_h.merge(backend_options)
-      @names = attribute_names.map(&:to_s)
+      @names = attribute_names.map(&:to_s).freeze
       raise Mobility::BackendRequired, "Backend option required if Mobility.config.default_backend is not set." if backend.nil?
       @backend_name = backend
     end

lib/mobility/backends/sequel/query_methods.rb

@@ -13,11 +13,11 @@ module Sequel
       class QueryMethods < Module
         # @param [Array<String>] attributes Translated attributes
         def initialize(attributes, _)
-          @attributes = attributes.map!(&:to_sym)
+          @attributes = attributes.map(&:to_sym)
 
-          attributes.each do |attribute|
+          @attributes.each do |attribute|
             define_method :"first_by_#{attribute}" do |value|
-              where(attribute.to_sym => value).select_all(model.table_name).first
+              where(attribute => value).select_all(model.table_name).first
             end
           end
         end