Hi Ludo, > The root problem is that the ‘fxbit-set?’ alias defined at the top of > openpgp.scm had the arguments swapped compared to ‘bit-set?’. So I > changed that alias instead of changing its users (‘fxbit-set?’ is > defined in R6RS). oh, okay. I looked at SRFI 143 which also has a fxbit-set? with the same argument order as bit-set?, so I thought the alias was mimicking that API. But this works too I guess. Thanks, Lars [1] https://srfi.schemers.org/srfi-143/srfi-143.html