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Add note to ST_Equals that the function does not support geometry collections #14
The problem is deeper than just ST_Equals. See http://lists.osgeo.org/pipermail/postgis-devel/2015-April/024827.html
If you have a homogeneous geometry collection, e.g. from ST_Polygonize, then use ST_CollectionExtract(geom, 3) to get a MultiPolygon, which works with ST_Equals and other relate functions.