[PostGIS] #5804: NULL geometries generated from ST_FORCE3D(geom, NULL)

[PostGIS]

#5804: NULL geometries generated from ST_FORCE3D(geom,NULL)
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 Reporter:  ponceta  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.4.4
Component:  postgis  |    Version:  3.4.x
 Keywords:  3D       |
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 It is not a recent bug but actually the result of

 ST_FORCE3D(geom,NULL) is NULL

 On the user side it seems like a bug since is should be equivalent as not
 providing the altitude value to the ST_FORCE3D function :

 ST_FORCE3D(geom) is the 3D geom with 0 as altitude which is the result of
 ST_FORCE3D(geom,0)

 Can we agree that it is a bug?
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5804>
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