Add test for flatbuffers array header - #437

score/flatbuffers/details/flatbuffers_array_test.cpp:664

• This downcast is undefined behavior: CastToArray(raw) does not produce an ArrayTestAccess<T,N> object, so static_casting the base reference to the derived type is invalid. Use an explicit reinterpret_cast overlay if you need to call the protected overloads.

    auto& accessor = static_cast<ArrayTestAccess<int32_t, 3>&>(CastToArray(raw));

score/flatbuffers/details/flatbuffers_array_test.cpp:683

• This downcast is undefined behavior: CastToArray(raw) does not produce an ArrayTestAccess<T,N> object, so static_casting the base reference to the derived type is invalid. Use an explicit reinterpret_cast overlay if you need to call the protected overloads.

    auto& accessor = static_cast<ArrayTestAccess<Point, 2>&>(CastToArray(raw));

score/flatbuffers/details/flatbuffers_array_test.cpp:756

• This reinterpret_cast assumes the byte buffer is suitably aligned (and large enough) for Array<Offset, 2>. Use alignas + sizeof(Array<...>) to avoid misalignment/size-related UB.

    uint8_t buf[2] = {0};
    const auto& arr = *reinterpret_cast<const Array<Offset<void>, 2>*>(buf);
    EXPECT_DEATH({ arr[0]; }, "");