added more testing of `value_cast` conversion accuracy when using integral types #17

Job	Run time
std::format none C++20 Clang-18 Release	5m 24s
std::format none C++20 Clang-18 Debug	5m 58s
std::format none C++23 Clang-18 Release	6m 20s
std::format none C++23 Clang-18 Debug	4m 3s
std::format gsl-lite C++20 Clang-18 Release	5m 16s
std::format gsl-lite C++20 Clang-18 Debug	5m 1s
std::format gsl-lite C++23 Clang-18 Release	5m 18s
std::format gsl-lite C++23 Clang-18 Debug	4m 56s
std::format ms-gsl C++20 Clang-18 Release	6m 28s
std::format ms-gsl C++20 Clang-18 Debug	5m 0s
std::format ms-gsl C++23 Clang-18 Release	6m 21s
std::format ms-gsl C++23 Clang-18 Debug	7m 26s
fmtlib none C++20 Clang-18 Release	5m 17s
fmtlib none C++20 Clang-18 Debug	4m 59s
fmtlib none C++23 Clang-18 Release	5m 9s
fmtlib none C++23 Clang-18 Debug	4m 55s
fmtlib gsl-lite C++20 Clang-18 Release	5m 22s
fmtlib gsl-lite C++20 Clang-18 Debug	4m 52s
fmtlib gsl-lite C++23 Clang-18 Release	5m 17s
fmtlib gsl-lite C++23 Clang-18 Debug	4m 58s
fmtlib ms-gsl C++20 Clang-18 Release	5m 27s
fmtlib ms-gsl C++20 Clang-18 Debug	5m 5s
fmtlib ms-gsl C++23 Clang-18 Release	5m 16s
fmtlib ms-gsl C++23 Clang-18 Debug	5m 7s
	2h 9m 15s

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