The implementation of default methods

[Brian Goetz]

> that a good reason to have a tag @implementation
> then you can write

I agree that having more structured places to put documentation 
information is probably helpful, but everyone talks about the 
@implementation tag as if it were a magic bullet, which it is not.  The 
harder issues are the ones we're thrashing out now, such as separating 
normative statements about default implementations from non-normative 
ones.