[PostGIS] #5725: Undocumented st_offsetcurve behaviour change between 3.2 and 3.3

[PostGIS]

#5725: Undocumented st_offsetcurve behaviour change between 3.2 and 3.3
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  Reporter:              |      Owner:  pramsey
  gbartonowenstl         |
      Type:  defect      |     Status:  new
  Priority:  medium      |  Milestone:  PostGIS GEOS
 Component:  postgis     |    Version:  3.3.x
Resolution:              |   Keywords:  offsetcurve, release notes,
                         |  st_offsetcurve, reversing
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Comment (by mdavis):

 This change happened in GEOS 3.11 with the switch to an improved offset
 curve algorithm.

 I'll add a [https://github.com/libgeos/geos/blob/main/NEWS.md?plain=1#L160
 GEOS NEWS note] about this being a change in behaviour, so it will be
 captured going forward.

 The PostGIS doc for `ST_OffsetCurve` should be updated to reflect this
 changed behaviour.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5725#comment:4>
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