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I am not entirely happy with this, since it seems overly complicated, and even I am not quite sure I believe it is really correct. Still, it does help squish a tricky bug (diagrams/diagrams-svg#43) which is actually a problem for some users (timbod7/haskell-chart#19), and passes the tests I could think of (see
test/SplitAttr.hs
).See also the discussion at #141 .