# File lib/active_model/validations/numericality.rb, line 16
      def check_validity!
        keys = CHECKS.keys - [:odd, :even]
        options.slice(*keys).each do |option, value|
          next if value.is_a?(Numeric) || value.is_a?(Proc) || value.is_a?(Symbol)
          raise ArgumentError, ":#{option} must be a number, a symbol or a proc"
        end
      end