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It was a development that seemed to come out of nowhere on Thursday, nudging 10- and 30-year Treasury yields above 4% and taking the steam out of U.S. stocks despite a round of resilient economic data.A news report by Nikkei about a likely tweak to the Bank of Japan’s yield-curve control was all it took for investors to realize that the world’s last remaining floor on interest rates might be shifting. The BoJ followed through on Friday, by switching to a more flexible policy that enables the country’s 10-year yield BX:TMBMKJP-10Y to rise above the 0.5% upper cap that’s been in place since December.In response, 10-year…