[postgis-tickets] [PostGIS] #3356: geometry to geography cast, always adds a box even for 2 point linestrings and single points

[PostGIS]

#3356: geometry to geography cast, always adds a box even for 2 point linestrings
and single points
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  Reporter:  robe     |      Owner:  robe
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.1.9
 Component:  postgis  |    Version:  2.1.x
Resolution:           |   Keywords:
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Comment (by pramsey):

 No, you don't want to strip the boxes from teh geographies, there's a big
 difference between geometry and geography boxes, because for geometry
 2-point boxes are trivial (just read first and last point) but for
 geographies they aren't (you have to check the range of the 3-space box,
 because sometimes the extrema are not the end points. Similarly (though
 less bad) even for points, because the box in geography is 3-space while
 the point is only 2d, the box requires more calculation, so having it pre-
 calculated and on the object is not a bad thing.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3356#comment:8>
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