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        std::wstring ws = L"test";
        printf("ws length = %d\n", ws.size());
        // => ws length = 4
        std::string s1 = fz::to_utf8(ws);
        printf("s1 length = %d\n", s1.size());
        // => s1 length = 4
        std::string s2 = fz::to_string(ws);
        printf("s2 length = %d\n", s2.size());
        // => s2 length = 0
        if (s1 == s2)
            printf("s1 == s2\n");
        else
            printf("s1 != s2\n");
        // => s1 != s2
        std::wstring ws1 = fz::to_wstring(s1);
        printf("ws1 length = %d\n", ws1.size());
        // => ws1 length = 0
        std::wstring ws2 = fz::to_wstring(s2);
        // => ws2 length = 0
        if (ws1 == ws2)
            printf("ws1 == ws2\n");
        else
            printf("ws1 != ws2\n");
        // => ws1 == ws2
        std::wstring ws3 = fz::to_wstring_from_utf8(s1);
        printf("ws3 length = %d\n", ws3.size());
        // => ws3 length = 4
        std::wstring ws4 = fz::to_wstring_from_utf8(s2);
        printf("ws4 length = %d\n", ws4.size());
        // => ws4 length = 0
        if (ws3 == ws4)
            printf("ws3 == ws4\n");
        else
            printf("ws3 != ws4\n");
        // => ws3 != ws4
        if (ws == ws3)
            printf("ws == ws3\n");
        else
            printf("ws != ws3\n");
        // => ws == ws3