The current trait implementation (which can be found in the
files lively/Traits.js and lively/Base.js) can be used to share
methods and other properties among different classes that
do not have a common superclass. SelectionMorphTrait
seems to be the only example of a trait that is actually
applied to more than one class in the Lively core, though.
I think the same functionality including seamless updating
of traits and trait inheritance can be achieved with a simpler