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Would you say it's a very very strong indicator of interest , more than asking your name or a hair toss?
Salut! its calibration, sometimes they ask you for your name just to be polite or they look at you probably because they thought you were a friend. I would say when they ask you for your name would be a stronger IOI (in some situations). You have to calibrate, most of the time the eye contact comes with a smile (could be the strongest IOI for me), or if she breaks the eye contact looking down that means that she wants to be approach.
Bonne chance my friend!!