[PostGIS] #5718: `st_isvalid(point(NaN, NaN))` is true

[PostGIS]

#5718: `st_isvalid(point(NaN, NaN))` is true
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  Reporter:  n0099    |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
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Changes (by n0099):

 * cc: n0099 (added)

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5718#comment:1>
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