[PostGIS] #6132: ST_LineMerge turns a set of fully-noded simple lines into a non-simple line

[PostGIS]

#6132: ST_LineMerge turns a set of fully-noded simple lines into a non-simple line
---------------------+---------------------------
 Reporter:  strk     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.7.0
Component:  postgis  |    Version:  3.6.x
 Keywords:           |
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 This is a spin-off of #6129 but focused on ST_LineMerge doing
 undocumented/unwanted editing of input lines.

 This 2 input lines:

   1.
 0102000020A2100000030000005163B45884333540352259FDE66A51406043FEC3BA333540C0BFF081E66A5140831D215B88333540107B41F4E66A5140
   2.
 0102000020A210000002000000685E205B88333540B7363CF4E66A5140831D215B88333540107B41F4E66A5140

 Are simple and have an endpoint in common. ST_LineMerge outputs a non-
 simple line:
 0102000020A2100000040000005163B45884333540352259FDE66A51406043FEC3BA333540C0BFF081E66A5140831D215B88333540107B41F4E66A5140685E205B88333540B7363CF4E66A5140
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6132>
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