Replace fmt::detail::vformat_to(buf,..) with fmt::vformat_to(fmt::appender(buf)
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		@@ -371,8 +371,7 @@ protected:
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#ifdef SPDLOG_USE_STD_FORMAT
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					#ifdef SPDLOG_USE_STD_FORMAT
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            fmt_lib::vformat_to(std::back_inserter(buf), fmt, fmt_lib::make_format_args(std::forward<Args>(args)...));
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					            fmt_lib::vformat_to(std::back_inserter(buf), fmt, fmt_lib::make_format_args(std::forward<Args>(args)...));
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#else
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					#else
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            // seems that fmt::detail::vformat_to(buf, ...) is ~20ns faster than fmt::vformat_to(std::back_inserter(buf),..)
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					            fmt::vformat_to(fmt::appender(buf), fmt, fmt::make_format_args(std::forward<Args>(args)...));
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            fmt::detail::vformat_to(buf, fmt, fmt::make_format_args(std::forward<Args>(args)...));
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#endif
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					#endif
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            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
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					            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
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