Fix TeleImage.__iter__ yielding fields in the wrong order

[winklemad]

Problem

TeleImage.__iter__ documents tuple-unpacking as:

""" Allow unpacking like: jpg, bgr, fps = teleimage_instance """

but yields the fields in a different order:

def __iter__(self):
    """ Allow unpacking like: jpg, bgr, fps = teleimage_instance """
    yield self.fps
    yield self.jpg
    yield (None if self._bgr is TeleImage._NOT_SET else self._bgr)

So a user who follows the documented usage gets every value bound to the wrong field:

img = TeleImage(fps=30.0, jpg=b"...", bgr=some_ndarray)
jpg, bgr, fps = img
# jpg -> 30.0            (the fps float)
# bgr -> b"..."          (the jpg bytes)
# fps -> some_ndarray    (the decoded image)

Fix

Yield jpg, bgr, fps so __iter__ matches its own docstring. This also matches the field order declared in __slots__ = ['jpg', '_bgr', 'fps']; the previous order followed the __init__ parameter order (fps, jpg, bgr) instead.

def __iter__(self):
    """ Allow unpacking like: jpg, bgr, fps = teleimage_instance """
    yield self.jpg
    yield (None if self._bgr is TeleImage._NOT_SET else self._bgr)
    yield self.fps

After the change, jpg, bgr, fps = img binds each name correctly.

If the intended contract was actually fps, jpg, bgr, the alternative fix would be to update the docstring instead — happy to switch to that if you prefer, but the __slots__ order suggests jpg, bgr, fps was intended.