Weird config behaviour

[sedol1339]

In the following example, I cannot override the field:

config = Config(config_dict={'dataset_path': 'data/questions'})
print(config["dataset_path"])

>>> dataset/nq

Internally, I see that config._get_final_config() returns a config with the correct field 'dataset_path': 'data/questions', but then it gets overridden here:

dataset_name = self.final_config["dataset_name"]
data_dir = self.final_config["data_dir"]
self.final_config["dataset_path"] = os.path.join(data_dir, dataset_name)

Is this intended? IMO this is counter intuitive behaviour