`items()` and `values()` are inherited from OrderedDict. Starting with Python 3.5, they will bypass the custom `__getitem__` (because OrderedDict is implemented in C now) and expose the actual `(time, value)` tuple.    In Python up to 3.4:        >>> list(d.items())      [('a', 1)]    In Python 3.5:        >>> list(d.items())      [('a', (1481032887.784956, 1))]  