[issue9120] Reduce pickle size for an empty set

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

> This begs a question, however: why not use regular python bytecode in pickles?

Unlike pickle protocols, the bytecode is not required to be compatible across Python versions. Furthermore, Python bytecode is designed has a general purpose object serialization mechanism.

For the record, I am with Raymond about adding new opcodes for sets; pickle is complicated enough as it is. I am fine with the posted patch however.

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