By the principle of "least-surprise" preserve_topology should probably default to True.
Powerusers will probably know that preserve_topology=True is more costly. Perhaps documentation could reflect this? There is some documentation in the GEOS headers (DouglasPeuckerSimplifier.h and TopologyPreservingSimplifier.h) that could be repeated for the simplify function. -- Helge Jensen Partner & Senior Software Developer
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