> Michael G Schwern wrote:
> 
> > Also, just being able to tack flags onto a variable means each
> > variable (that has a flag) would have to carry around a hash!

No; it has to carry around a vtbl (or vtbl-like thing).
User-level attributes are (or should be :-) accessor methods
to some underlying implementation.
OTOH, I suppose a vtbl is itself like hash...

-- 
John Porter

        By pressing down a special key  It plays a little melody

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