If you draw two lines (line A and B) that are connected at one point(point P) the persistent id on this point is:
A.end.persistent_id
or
B.start.persistent_id
because you're referring to the same point.
Now if you put one of the lines in a group the point P has now two persistent ids. This should be named just id because its not persistent.
A
Posts made by arion
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Persistent_id is not persistent