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I've just dusted off some old 5.1 ESRI Shapefile reading code that uses LHF's lpack.  What's happened to lpack in the last few years?

If I understand correctly, Roberto's struct library superseded pack?  I also somehow got the idea that 5.2 had a string.pack and unpack that did the same job, but maybe I'm just confusing pack moving into table.pack?

If I should upgrade to struct, how compatible are they?