I was the person who updated the pickle jar in trac 9265. Like Jeroen, "I 
personally don't know much about the pickle jar in Sage", but I was given 
some instructions about what to do which came down to set SAGE_PICKLE_JAR,untar 
the pickle jar and copy the new pickles in, and tar the jar up 
again.I certainly was not aware that old pickles (which are essentially 
being deprecated) should not be removed.

It would help if there was some good (or even bad) documentation available 
which described how to update the pickle jar. As far as I am aware this is 
not covered in the developers guide, or anywhere else. I did search for 
documentation to complement the notes that I was given but I only found an 
oblique reference to occasionally needing to update the pickle jar in 
sage.structure.sage_object.unpickle_all and 
http://trac.sagemath.org/sage_trac/ticket/10768 which opens a ticket to 
improve the current mechanism.

If it is decided that the pickles that I removed need to be reinstated I'll 
do this of course. I suggest that the best way to do this is with an 
additional ticket/patch on top of #9265.

Andrew

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