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Rework explanation a bit (thanks flaviu)

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def 2015-03-26 18:08:58 +01:00
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@ -83,9 +83,9 @@ no ancestor are implicitly ``final``. You can use the ``inheritable`` pragma
to introduce new object roots apart from ``system.RootObj``. (This is used
in the GTK wrapper for instance.)
We always use ref objects for inheritance in this tutorial. When you store a
non-ref object in a variable of a parent type, the additional fields are cut
off.
Ref objects should be used whenever inheritance is used. It isn't strictly
necessary, but with non-ref objects assignments such as ``let person: Person =
Student(id: 123)`` will truncate subclass fields.
**Note**: Composition (*has-a* relation) is often preferable to inheritance
(*is-a* relation) for simple code reuse. Since objects are value types in