[geos-devel] OverlayNG as Default

[Paul Ramsey]

OK, it's been a while, and I'd like to flip over GEOS master to use
OverlayNG as the engine behind

Geometry.intersection()
Geometry.difference()
Geometry.union()
Geometry.symdifference()
Geometry.unaryunion()

That will entail changing the expected outputs for a few of the regression
tests, as detailed here.

https://docs.google.com/document/d/1TDm2aR4a7O41-soS-25Xog1EdQcjmvKCnKltxjbxOC0/edit#heading=h.ojs23hjdmk7a

Once that is done, regressions in PostGIS and other downstream projects can
be #ifdef'ed around GEOS version. As seen in the document above, there
actually aren't than many cases that need special handling in PostGIS, and
hopefully not in other downstream projects.

If you have any concerns, please light your hair on fair in the next couple
days.

P.
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