Logged In: YES 
user_id=1547199

A misinterpretation:
I think it *should* become the circle method. (It were a 
weird idea to introduce a circle2 method anyway). I only
named it circle2 for now and test purposes in order to 
compare the behaviours of the two. If you are content
with the patch, replace circle by circle2 'as circle' - if
not leave circle2 out and let everything as is. Imho the 
the points to think about are:
(i) is the polygon approximation ok? I think, my testscript
gives a positive answer: the polygons are visually nearly
indistiguishable from the canvas circle items. (Moreover I
tested it with radiuses in the range from 1 to 200
successfully) 
(ii)that the new method relies on the forward method and
thus circles are drawn much slower. For me this is quite ok.