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before this change, we rely on the default-generated fmt::formatter created from operator<<, but fmt v10 dropped the default-generated formatter. in this change, we define a formatter for data_value, but its its operator<<() is preserved as we are still using the generic homebrew formatter for formatting std::vector, which in turn uses operator<< of the element type. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#16767