register_class_with_precision

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 520
      def register_class_with_precision(mapping, key, klass) # :nodoc:
        mapping.register_type(key) do |*args|
          precision = extract_precision(args.last)
          klass.new(precision: precision)
        end
      end