[PostGIS] #6037: st_union with gridSize produces unexpected result

[PostGIS]

#6037: st_union with gridSize produces unexpected result
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  Reporter:  Asger Skovbo Petersen  |      Owner:  pramsey
      Type:  defect                 |     Status:  new
  Priority:  medium                 |  Milestone:
 Component:  postgis                |    Version:  3.6.x
Resolution:                         |   Keywords:
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Comment (by mdavis):

 Replying to [comment:2 Asger Skovbo Petersen]:
 > If the current behavior is intended, I think the documentation should be
 updated. Currently, it says:
 >
 > “For the operation to give predictable results all the input vertices
 must fall already on the specified grid.”

 Agreed.  It would be more accurate to say:

 "For the operation to give predictable results the inputs should be snap-
 rounded to the specified grid.”
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6037#comment:3>
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