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I recommend this as a wontfix.  

As the page itself notes, browsers generally got this 
wrong, and existing webpages rely on this buggy behavior.  
Even today, Opera is going back and forth on how right they 
can afford to be without breaking too many pages.

The suggestion at the bottom of the page notes that if you 
keep your comments sane, you won't have problems on your 
own pages.  Realistically, anything not following that rule 
(no embedded -- or >) is effectively buggy, and HTMLParser 
can only guess at the real intention.