Non-valuable data is propagated through request sequences

[AlexB1986]

Hi Team!
While testing Fuzz-lightyear against Mozilla Kinto we have faced with issue related with propagating non-valuable data through request sequences.
Could you please check our results?

While generating a sequence of requests method add_response() called with some response as an input:

To extract data add_response() use for loop with dir(response).
But in that case dir(response) equals to

['__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']

As a result we have non-valuable data in self.data (this data is used to construct nest request in a sequence):

Seems that we should use response.keys() instead of dir(response):

....
for key in response.keys():
    self.data[key] = response[key]
...

Do we miss something in our reasoning? Are there any cases when dir(response) is needed?