Refs #36036 -- Added note about z argument in GEOSCoordSeq.__init__().

When dropping support for GEOS 3.13 the `GEOSCoordSeq_hasZ()` function will be available on all supported GEOS versions. Instead of the parent geometry providing the z dimension we can reply on GEOSCoordSeq functions directly. This will follow a similar implementation to what was done for the M dimension.

While it could be adopted earlier we would need to guess that geometries with 3 dimensions on GEOS < 3.14 are Z geometries.

Author: smithdc1

django/contrib/gis/geos/coordseq.py

@@ -20,6 +20,8 @@ class GEOSCoordSeq(GEOSBase):
 
     def __init__(self, ptr, z=False):
         "Initialize from a GEOS pointer."
+        # TODO when dropping support for GEOS 3.13 the z argument can be
+        # deprecated in favor of using the GEOS function GEOSCoordSeq_hasZ.
         if not isinstance(ptr, CS_PTR):
             raise TypeError("Coordinate sequence should initialize with a CS_PTR.")
         self._ptr = ptr