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Here's pure python code for expirmentation:
 from marshal import dumps, loads
 def marshal_set(s):
 return dumps(sorted((dumps(value), value) for value in s))
 def unmarshal_set(m):
 return {value for dump, value in loads(m)}
 def test(s):
 assert unmarshal_set(marshal_set(s)) == s
 
 test({("string", 1), ("string", 2), ("string", 3)})