Method write

tests/fl/fx/video.cpp:60–63

u8 overload

    }
    using fl::filebuf::read; // u8 overload
    size_t write(const char *dat, size_t count) override {
        (void)dat; (void)count;
        return 0;
    }
    size_t tell() override { return mPos; }
    const char *path() const override { return "fake"; }
    bool seek(size_t pos, fl::seek_dir dir) override {