KARACHI: Global investors have piled $642.5 million into local-currency bonds this month alone, more than what they invested in the debt in the past four years, according to central-bank data going back to 2015, Bloomberg reported.Foreign inflows into short term treasury bills crossed the $1 billion mark this fiscal year, State bank data showed.The SBP data showed that the country received $1.097 billion investment in T-bills from July 1 to November 19. In the auction held on November 20,...