feat: proper constraints for `kind_of` #415

Job	Run time
Generate build matrix for Freestanding CI	9s
Clang-18 (x86-64) C++23 fmtlib none Release	2m 5s
Clang-18 (x86-64) C++23 std::format none Release	1m 58s
GCC-14 C++23 fmtlib none Debug	2m 25s
GCC-14 C++23 fmtlib none Release	1m 24s
GCC-14 C++23 std::format none Debug	1m 24s
GCC-14 C++23 std::format none Release	1m 30s
	10m 55s

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