[PostGIS] #5962: Inconsistent results in multipoint clipping

[PostGIS]

#5962: Inconsistent results in multipoint clipping
---------------------+---------------------------
 Reporter:  bradh    |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  low      |  Milestone:  PostGIS 3.5.4
Component:  postgis  |    Version:  3.4.x
 Keywords:           |
---------------------+---------------------------
 This seems reasonable to me.

 {{{
 SELECT ST_AsText(ST_ClipByBox2D(ST_GeomFromText('MULTIPOINT((1 1),(3 4),(5
 4))'), ST_MakeEnvelope(0, 0, 5, 5 )));
            st_astext
 -------------------------------
  MULTIPOINT((1 1),(3 4),(5 4))

 }}}

 However:
 {{{
 SELECT ST_AsText(ST_ClipByBox2D(ST_GeomFromText('MULTIPOINT((1 1),(6 4),(5
 4))'), ST_MakeEnvelope(0, 0, 5, 5 )));
  st_astext
 ------------
  POINT(1 1)
 }}}

 seems inconsistent with that. I would have expected `(5 4)` to be included
 in both, or potentially excluded in both if there was a representation-
 of-5-as-double type issue.

 ```


 However
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5962>
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