set_dynamic_spec compares signed integers against unsigned

[rwy7]

the problematic comparison is at include/fmt/format.h:2091, resulting in this message:

../external/fmt/include/fmt/format.h:2091:17: warning: comparison of integer expressions of different signedness: ‘long long unsigned int’ and ‘int’ [-Wsign-compare]
 2091 |   if (big_value > max_value<int>()) eh.on_error("number is too big");

The complete error message is quite large due to template expansion.

[vitaut]

Should be fixed in 758446c. Thanks for reporting!

[rwy7]

Thank you for fixing!