[postgis-tickets] [PostGIS] #5262: Add support of Undefined Cartesian SRS (-1)

[PostGIS]

#5262: Add support of Undefined Cartesian SRS (-1)
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  Reporter:  lbartoletti  |      Owner:  pramsey
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS 3.4.0
 Component:  postgis      |    Version:  3.3.x
Resolution:               |   Keywords:
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Comment (by pramsey):

 It's not possible to literally store -1 in the SRID slot, as we moved to
 positive-only in order to maximize our use of the limited number of bits
 available in our 24-bit SRID slot in the serialization. Having a sign bit
 and then using only one negative SRID would mean throwing away half our
 SRID storage space. Not sure why using 0 is not practicable for 99% of use
 cases.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5262#comment:3>
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