On Feb 7, 2012, at 1:17 PM, Robby Findler wrote:

> I don't see too much value in the former if it is just a hint.
> Seems useful to have that information in the documentation, tho.


The implementation of the template hook pattern is a good example of abstract 
methods. A programmer who wishes to extend a class can either search the 
existing abstract class for all uses of the method and infer the right 
signature from that or the abstract method signature can tell the programmer 
what is expected. 
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