[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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Comment (by mdavis):

 Also an error in GEOS:
 {{{
 bin/geosop -a 0101000000000000000000F8FF000000000000F8FF isValid
 true
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5718#comment:2>
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