MSVC's optional<>::operator== does not support SFINAE #351

Job	Run time
extra (windows-latest, std::uint32_t, cxx_std_17)	4m 3s
extra (windows-latest, std::uint32_t, cxx_std_20)	4m 16s
extra (windows-latest, std::uint64_t, cxx_std_17)	4m 3s
extra (windows-latest, std::uint64_t, cxx_std_20)	4m 36s
linux (ubuntu-latest, g++, g++, 10)	52s
extra (macOS-latest, std::uint32_t, cxx_std_17)	2m 20s
linux (ubuntu-latest, g++, g++, 11)	52s
extra (macOS-latest, std::uint32_t, cxx_std_20)	2m 29s
linux (ubuntu-latest, g++, g++, 12)	54s
extra (macOS-latest, std::uint64_t, cxx_std_17)	1m 49s
linux (ubuntu-latest, clang, clang++, 12)	53s
extra (macOS-latest, std::uint64_t, cxx_std_20)	2m 40s
linux (ubuntu-latest, clang, clang++, 13)	41s
extra (ubuntu-latest, std::uint32_t, cxx_std_17)	2m 51s
linux (ubuntu-latest, clang, clang++, 14)	35s
linux (ubuntu-20.04, g++, g++, 7)	55s
extra (ubuntu-latest, std::uint32_t, cxx_std_20)	3m 45s
extra (ubuntu-latest, std::uint64_t, cxx_std_17)	3m 30s
linux (ubuntu-20.04, g++, g++, 8)	58s
linux (ubuntu-20.04, g++, g++, 9)	56s
extra (ubuntu-latest, std::uint64_t, cxx_std_20)	3m 31s
linux (ubuntu-20.04, clang, clang++, 8)	57s
linux (ubuntu-20.04, clang, clang++, 9)	54s
macos	3m 6s
linux (ubuntu-20.04, clang, clang++, 10)	56s
linux (ubuntu-20.04, clang, clang++, 11)	53s
windows (default)	5m 8s
windows (v141)	4m 40s
windows (v142)	4m 1s
windows (clang-cl)	6m 21s
	1h 14m 25s

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