Fixed conversion of `std::basic_string_view` and `boost::basic_string… #104

Job	Run time
windows (msvc, 14,17,latest, 32,64, windows-2022)	8m 53s
windows (msvc-14.2, 14,17,latest, 32,64, windows-2019)	7m 55s
posix (gcc-12, 03,11,14,17,2a, ubuntu-22.04, cxxflags=--coverage -fsanitize=address,leak,undefine...	11m 26s
windows (gcc, 03,11,14,17,2a, 64, windows-2019)	6m 5s
posix (gcc-9, 03,11,14,17,2a, ubuntu-22.04)	3m 47s
posix (clang, clang++-10, 03,11,14,17,2a, ubuntu-20.04, cxxflags=-fsanitize=address,undefined,int...	5m 49s
posix (clang, clang++-14, 03,11,14,17,2a, ubuntu-22.04)	4m 32s
posix (clang, 11,14,17,20, macos-13)	5m 38s
finish	0s
	54m 5s

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