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Changes between Initial Version and Version 1 of Ticket #4979, comment 6

initial	v1
1	1	We have no contol over what packagers do. I think most no longer remove old releases cause then it would be difficult for people to pg_upgrade from say 2.5 to 3 or 3.1. Note that in the case of pg_upgrade, which many people use these days, both a 2.5 and 3. lib file must exist in the PG12 if you are say upgrading from PG11 to PG12.
2	2
3		I'll test on windows to make sure it's not an issue there, but I doubt it is because at least as far as windows is concerned I statically include liblwgeom in PostGIS 2.5, 2.4 with one of the reasons being for this kind of thing. Around 3.0/3.1 I we made this the official thing by not exporting liblwgeom anymore. Before debian would have a patch to undo this and then we saw these kinds of issues with liblwgeom from a previous release latching on to a newer PostGIS.
	3	I'll test on windows to make sure it's not an issue there, but I doubt it is because at least as far as windows is concerned I statically include liblwgeom in PostGIS 2.5, 2.4 with one of the reasons being for this kind of thing. Around 3.0/3.1 we made this the official thing by not exporting liblwgeom anymore. Before debian would have a patch to undo this and then we saw these kinds of issues with liblwgeom from a previous release latching on to a newer PostGIS.