[R] test to see if a s4 property is assigned?

[darckeen]

>
setClass("person",representation(age="numeric",weight="numeric"),prototype(age=NULL,weight=NULL))
[1] "person"
> bob <- new("person",age=30)
Error in validObject(.Object) : 
  invalid class "person" object: invalid object for slot "weight" in class
"person": got class "NULL", should be or extend class "numeric"

So I guess I can only protoype a property to NULL if its defined as ANY?  I
though there might be a way to test if a propery was assigned to get around
this.  Really kinda turns me off from S4 classes :\
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