Fix test failures on MySQL

There were a few places where I missed a `create` vs `new`
before_type_cast check, and the semantics of `reload` became wrong.

activerecord/lib/active_record/attribute_methods/dirty.rb

@@ -35,7 +35,9 @@ def save!(*)
       # <tt>reload</tt> the record and clears changed attributes.
       def reload(*)
         super.tap do
-          clear_changes_information
+          @mutation_tracker = AttributeMutationTracker.new(@attributes)
+          @previous_mutation_tracker = nil
+          @changed_attributes = HashWithIndifferentAccess.new
         end
       end
 

activerecord/test/cases/attribute_methods_test.rb

@@ -177,7 +177,7 @@ def test_read_attributes_before_type_cast
 
   if current_adapter?(:MysqlAdapter, :Mysql2Adapter)
     def test_read_attributes_before_type_cast_on_boolean
-      bool = Boolean.create({ "value" => false })
+      bool = Boolean.new({ "value" => false })
       if RUBY_PLATFORM =~ /java/
         # JRuby will return the value before typecast as string
         assert_equal "0", bool.reload.attributes_before_type_cast["value"]

activerecord/test/cases/integration_test.rb

@@ -96,7 +96,9 @@ def test_cache_key_changes_when_child_touched
     owner.update_column :updated_at, Time.current
     key = owner.cache_key
 
-    assert pet.touch
+    travel(1.second) do
+      assert pet.touch
+    end
     assert_not_equal key, owner.reload.cache_key
   end