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Consider the following testcase
class X:
 def meth(self):
 print(self)
 super()
def f():
 k = X()
 def g():
 return k
 return g
c = f().__closure__[0]
X.meth(c)
With patch
$ ./python unboxing.py 
<cell at 0x7fddacab1eb8: X object at 0x7fddac7876d8>
Without patch
$ ./python unboxing.py
<cell at 0x7f2d0a218eb8: X object at 0x7f2d09eee6d8>
Traceback (most recent call last):
 File "x.py", line 12, in <module>
 X.meth(c)
 File "x.py", line 4, in meth
 super()
TypeError: super(type, obj): obj must be an instance or subtype of type
Maybe you don't care. OTOH, perhaps it could be fixed by checking if the first argument is in fact a closure in super().
In the best world, super() would be syntax instead of a call, and we would just push the __class__ the closure and first argument in the interpreter loop.