Well that's an astute observation.
Perhaps we'll get lucky and one of the Google staff will comment.

On Jul 21, 7:55 am, Nianwei Liu <nian...@gmail.com> wrote:
> After some extra thinking I believe this should always work, it has
> nothing to do with undocumented feature.
>
> The fact is that the the drag action triggers Marker set('position')
> which is bind to the Polyline path's set('prefix'<i>) method. It then
> calls setAt, and that is a legit method to triggers a poly redraw.

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