Hi all: as per [1] we are looking into how GeoAlchemy2 [2] communicates with 
PostGIS when creating columns of type geometry.  Below are two variations of 
table creation/geometry column definition:

a./ create table testptz (pkey integer primary key, geom geometry);

b./ create table testptz (pkey integer primary key, geom geometry(geometry, 0));

The issue/context is being able to insert both POINT and POINTZ geometries into 
a given table.

GeoAlchemy runs the SQL in option b to create the table but runs into error 
when trying to insert as follows:

insert into testptz values (1, 'POINT(0 0 0)');
ERROR: Geometry has Z dimension but column does not

When running the insert command against option a, everything works.  Any 
idea/suggestions?

Thanks

..Tom

[1] https://groups.google.com/forum/#!topic/geoalchemy/LxC9y2JsXhg
[2] https://geoalchemy-2.readthedocs.io/en/latest/

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