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0b69a1badc
in fmt v10, it does not cast unaligned<T> to T when formatting it, instead it insists on finding a matched fmt::formatter<> specialization for it. that's why we have FTBFS with fmt v10 when printing these packed<T> variables with fmtlib v10. in this change, we just cast them to the underlying types before formatting them. because seastar::unaligned<T> does not provide a method for accessing the raw value, neither does it provide a type alias of the type of the underlying raw value, we have to cast to the type without deducing it from the printed value. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#16167