The arguments both for and against Aadhaar, the 12-digit biometrically linked unique identification number that the government wants every Indian resident to have, are known by now. But they have crystallised in the Supreme Court over the last week, as petitioners appealed against amendments to the Income Tax Act that make Aadhaar mandatory for filing tax returns. The arguments were made just days after it was reported that the biometric details of 13.5 crore Indians had been revealed on government websites. It has been an illuminating week. What the government thinks of civil rights and liberties, what has merely been