PostGIS topology failures on PostgreSQL 10

[robe]

After I was done fixing all the raster issues with PostgreSQL 10, surprise surprise. topology has issues too.

Creating database 'postgis_reg'
Loading PostGIS into 'postgis_reg'
Loading Topology into 'postgis_reg'
PostgreSQL 10beta1 on x86_64-w64-mingw32, compiled by gcc.exe (x86_64-win32-seh-rev4, Built by MinGW-W64 project) 4.9.2, 64-bit
  Postgis 2.4.0dev - r15404 - 2017-05-26 06:16:27
  scripts 2.4.0dev r15404
  GEOS: 3.7.0dev-CAPI-1.11.0 8fe2ce6
  PROJ: Rel. 4.9.1, 04 March 2015

Running tests

 regress/legacy_validate .. ok
 regress/legacy_predicate .. ok
 regress/legacy_invalid .. ok
 regress/sqlmm .. ok
 regress/legacy_query .. ok
 regress/addnode .. ok
 regress/addedge .. ok
 regress/addface .. ok
 regress/addface2.5d .. ok
 regress/addtopogeometrycolumn .. ok
 regress/polygonize .. ok
 regress/st_addisoedge .. ok
 regress/st_addisonode .. ok
 regress/st_addedgemodface .. ok
 regress/st_addedgenewfaces .. ok
 regress/st_changeedgegeom .. ok
 regress/st_createtopogeo .. ok
 regress/st_getfacegeometry .. ok
 regress/st_getfaceedges .. ok
 regress/st_modedgeheal .. ok
 regress/st_modedgesplit .. ok
 regress/st_newedgeheal .. ok
 regress/st_newedgessplit .. ok
 regress/st_remedgenewface .. ok
 regress/st_remedgemodface .. ok
 regress/st_simplify .. failed (diff expected obtained: /projects/postgis/tmp/2.4_pg10w64/test_26_diff)
 regress/topoelement .. ok
 regress/topoelementarray_agg .. ok
 regress/topogeo_addlinestring .. ok
 regress/topogeo_addpoint .. ok
 regress/topogeo_addpolygon .. ok
 regress/topogeom_edit .. failed (diff expected obtained: /projects/postgis/tmp/2.4_pg10w64/test_32_diff)
 regress/topogeometry_type .. ok
 regress/topojson .. ok
 regress/topologysummary .. ok
 regress/topo2.5d .. ok
 regress/totopogeom .. failed (diff expected obtained: /projects/postgis/tmp/2.4_pg10w64/test_37_diff)
 regress/droptopology .. ok
 regress/droptopogeometrycolumn .. ok
 regress/copytopology .. failed (diff expected obtained: /projects/postgis/tmp/2.4_pg10w64/test_40_diff)
 regress/createtopogeom .. ok
 regress/createtopology .. ok
 regress/gml .. ok
 regress/getnodebypoint .. ok
 regress/getedgebypoint .. ok
 regress/getfacebypoint .. ok
 regress/getringedges .. ok
 regress/gettopogeomelements .. ok
 regress/layertrigger .. ok
 regress/validatetopology .. ok
 uninstall .. ok (4662)

Run tests: 51
Failed: 4