> If i have to establish is-a relation, i'd rather do this via simple
property than prototypes.
Exactly, I keept the sample small and ignore that part, if You need it You
can use this
Model = function(){}
Validatable = function(klass){
// do all needed extensions ...
klass.prototype.isValidatable = true
}
Validatable(Model)
model = new Model()
if(model.isValidatable) ...
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