Kristján Valur Jónsson added the comment:

This change is specifically aimed at code objects.
As it is, it is impossible to produce code objects that share common data (e.g. 
filename strings, common tuples, name strings, etc) that don't unserialize to 
separate objects.

Also, separately but related (see second patch) the effort spent in interning 
names when compiling, is lost when code objects are loaded back from disk.

This change is based on work done at CCP to reduce the size of compiled code in 
memory.  Simple preprocessing of code objects prior to writing them to disk can 
result in important memory savings.


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