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There was a legitimate reason to have this duplication when the library was much smaller. However, hovering at about 30 kLOCs, the library is definitely not small enough anymore to mandate reimplementing our own <type_traits>. Also, most user code will probably include <type_traits> anyway, so using <type_traits> will not increase the overall compilation time in actual code bases. Finally, this gives us much more flexibility, like the ability to inherit our IntegralConstant from std::integral_constant, and then return that from the traits:: metafunctions, so that operators can be used with them.