Rule 4-9-2 The inside edges of the boundary lines define the inbounds and out-of-bounds areas.
It is not a violation unless the player making the throw-in touches an inbounds location.
I'm sure you've been to gyms where the "sideline" is about 3 feet wide. We allow the inbounder to step all over that "line" right? The logic is the same, even if the line is only two-inches wide.
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