2 files changed, 17 insertions, 3 deletions
diff --git a/activemodel/lib/active_model/type/string.rb b/activemodel/lib/active_model/type/string.rb
index c7e0208a5a..850cab962b 100644
--- a/activemodel/lib/active_model/type/string.rb
+++ b/activemodel/lib/active_model/type/string.rb
@@ -12,7 +12,12 @@ module ActiveModel
       private
 
         def cast_value(value)
-          ::String.new(super)
+          case value
+          when ::String then ::String.new(value)
+          when true then "t".freeze
+          when false then "f".freeze
+          else value.to_s
+          end
         end
     end
   end
diff --git a/activemodel/test/cases/type/string_test.rb b/activemodel/test/cases/type/string_test.rb
index 222083817e..47d412e27e 100644
--- a/activemodel/test/cases/type/string_test.rb
+++ b/activemodel/test/cases/type/string_test.rb
@@ -12,16 +12,25 @@ module ActiveModel
       end
 
       test "cast strings are mutable" do
-        s = "foo"
         type = Type::String.new
+
+        s = "foo"
         assert_equal false, type.cast(s).frozen?
+        assert_equal false, s.frozen?
+
+        f = "foo".freeze
+        assert_equal false, type.cast(f).frozen?
+        assert_equal true, f.frozen?
       end
 
       test "values are duped coming out" do
-        s = "foo"
         type = Type::String.new
+
+        s = "foo"
         assert_not_same s, type.cast(s)
+        assert_equal s, type.cast(s)
         assert_not_same s, type.deserialize(s)
+        assert_equal s, type.deserialize(s)
       end
     end
   end