Best way to associate some data with `ObjectProxy`? about wrapt HOT 3 OPEN

import wrapt

class Wrapper(wrapt.ObjectProxy):

    # Declare class attribute so lookup will work even
    # though going to use the attribute on the instance.

    data = "wrapper"

    def __init__(self, wrapped, data=None):
        super().__init__(wrapped)

        # Since setting on instance, will convert the class
        # attribute to an instance variable. The original
        # class attribute declaration means it will not
        # be on the wrapped object.

        self.data = data

class Wrapped: pass

o = Wrapped()

p1 = Wrapper(o, "p1")
p2 = Wrapper(o, "p2")

print(Wrapper.data)

print(p1.data)
print(p2.data)

p1.data = "p1-update"
p2.data = "p2-update"

print(Wrapper.data)

print(p1.data)
print(p2.data)

print(dir(o))

o.data = "wrapped"

print(o.data)

print(Wrapper.data)

print(p1.data)
print(p2.data)

print(dir(o))

wrapper
p1
p2
wrapper

p1-update
p2-update
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']

wrapped
wrapper
p1-update
p2-update
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'data']

class Wrapper(wrapt.ObjectProxy):

    # Declare a slot for the attribute so lookup will work against
    # the instance and not go through to the wrapped object.

    __slots__ = ["data"]

    def __init__(self, wrapped, data=None):
        super().__init__(wrapped)

        self.data = data