take in to account quoted and translated values

lib/arel/select_manager.rb

@@ -17,7 +17,7 @@ module Arel
     end
 
     def limit
-      @ast.limit && @ast.limit.expr
+      @ast.limit && @ast.limit.expr.expr
     end
     alias :taken :limit
 

test/test_factory_methods.rb

@@ -37,7 +37,7 @@ module Arel
         lower = @factory.lower :one
         assert_instance_of Nodes::NamedFunction, lower
         assert_equal 'LOWER', lower.name
-        assert_equal [:one], lower.expressions
+        assert_equal [:one], lower.expressions.map(&:expr)
       end
     end
   end