Dear developers, It appears that a sage object saved with the "save" command can sometimes be not loaded again with "load". It is the second time in a month that people complains that it is not working (because of Sage version mismatch).
situation number 1: Attached to https://arxiv.org/abs/1802.06923 there are various sobj files (storing matrices over number fields). These files do not load anymore on more recent sage versions! (For some strange reason the pickle is half broken because the pickle contains "implementation='flint'" (which is not available over number fields). situation number 2: a colleague has access to 2 Sage versions. On his laptop and on some server. He hoped that doing "save" on the server and "load" on his laptop he would be able to transfer data... Again it does not work (with symbolic expressions). In the current situation I think we should disable the save/load (or at least warn) to make it clear that it is not safe across version. I opened the following for the issue https://trac.sagemath.org/ticket/28302 On the other hand, I think this feature is almost essential to Sage (just because two people complained to me about this). The early developers of Sage had the wonderful idea of the pickle jar. But it only contains old objects. Let me recall the existence of the long standing https://trac.sagemath.org/ticket/10768 Best Vincent -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/c87b4b01-ab7f-6b36-f667-f608f9af8445%40gmail.com.
