The `Value=` should not be serialized (enumerable data)

[sandrock]

These unit tests are bugged:

• SerializeEnumerableMethod.SerializeEnumerableMethod
• SerializeEnumerableMethod.Value_Item
• SerializeEnumerableMethod.Value_Item_Value

And the implementation is wrong.

This assert type: Assert.Equal("Hello;Foo=Bar;Value=Yop", result); fails.
We get "Value=Hello;Foo=Bar;Value=Yop"