> But it is odd, indeed, why return anything at all. 

It depends on the class. Some use it and some do not
http://java.sun.com/j2se/1.4.2/docs/api/java/util/AbstractCollection.html#add(java.lang.Object)


> I don't believe that it ever does return false and the docs do not
> indicate that it does. Indeed, it is almost certainly using the add
> method of the java AbstractList object (from which it inherits). This
> states that it returns true only. If there is an error, an exception
> is thrown.
> 

It may not be due to the java link.  I found a reference that says ArrayAppend 
returned a boolean back in the days of CF 4.5.  So it may just be a carry over.

Though 


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