Problem: in Python package, `Pool.get_label()` returns list of True if label passed is list of boolean Code to reproduce: ```python import catboost pool = catboost.Pool([[0], [0]], label=[False, True]) assert pool.get_label() == [True, True] pool = catboost.Pool([[0], [0]], label=[True, False]) assert pool.get_label() == [True, True] pool = catboost.Pool([[0], [0]], label=[False, False]) assert pool.get_label() == [True, True] ``` catboost version: 1.0.6 Operating System: Ubuntu 20.04.04 LTS CPU: Intel i7