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Convertible bonds of the 2020-2021 vintage have aged surprisingly well.

A crop of so-called out-of-the-money convertibles have attributes that should lead investors to shun them, including an underlying stock that has fallen far below the conversion price and a zero- or near-zero coupon while the Fed funds rate is above 5%. High conversion prices — even to bull-market standards when they were issued — mean many of these notes will never switch into equities.