Shape tween vector points

i would like to understand (if possible) how flash deals with
shape tweens?
does it try and recognize shapes in order to find what it's
common between two shapes or does it more simply try to establish a
link between vector points according to the closest corresponding
position?
is there no way of, say, switching off the attempt of shape
recognition?
why aren't hints automatically attached to vector points
within a same layer?
thx - p

1. In my experience, Flash merges extra points into one, and
breaks single points into multiple as necessary. how it picks which
ones to do this with has always been beyond me.
2. It seems to be completely by position, but only an Adobe
engineer could tell you how the algorithm works.
3. Hints are not automatically attached to anything. You can
add as many hints as you want, and place them wherever you want. If
you place a hint on each vector point, and place them on the
correct places at the end of the tween, then flash will make sure
the points start and finish where you want them to.
4. Vector points, to my understanding, hold their position,
and any information necessary for the calculation of bezier
curves.

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