Bat hitting ball twice is same interp as ball hitting batter. If batter is in box, he's okay, as long as contact was not intentional. You won't find it in the rulebook. As UmpTTS said, its just old language that never got changed when when the plate was moved into fair territory.
Barring anything intentional on the batter's part, its a foul ball unless a whole foot is outside the box.
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