[PostGIS] #5976: GML input function crashes on 3.5.3--3.6.0dev upgrade

[PostGIS]

#5976: GML input function crashes on 3.5.3--3.6.0dev upgrade
---------------------+---------------------------
 Reporter:  strk     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  blocker  |  Milestone:  PostGIS 3.6.0
Component:  postgis  |    Version:  3.5.x
 Keywords:           |
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 This crashes for me:
 `regress/run_test.pl --extension --upgrade --upgrade-path 3.5.3--3.6.0dev
 -v regress/core/in_gml.sql`

 The crash:
 {{{
 psql:in_gml.sql:997: ERROR:  invalid GML representation
 psql:in_gml.sql:1000: server closed the connection unexpectedly
         This probably means the server terminated abnormally
         before or while processing the request.
 }}}

 I didn't see a "3.6.0" tag, but I see a "3.6.1" milestone, what's the deal
 ? This is happening in stable-3.6 branch
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5976>
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