01:13 <Na> ohsix: I think intersection treats all intersections as four-way, so when you've got a T instead of an X one of the arms has length 0

04:53 <ohsix> Na: that sounds plausible, what i was doing is intersecting an X, then you end up with another intersection to make, like a rectangle intersecting a circle

16:49 <Na> Ah, yeah, I was remembering http://solvespace.com/2d.pl which (implicitly) points out that solvespace will only do one intersection at a time

16:51 <whitequark> there's no real reason it ought to only do one at a time, it's just not implemented

17:06 <Na> ohsix: doing a circle/rectangle intersection doesn't seem to generate any zero-length edges for me, but I do need to intersect things twice like you mentioned