https://clickhouse-test-reports.s3.yandex.net/20492/c5b96a522e29b38eae3f6c2d945540dd234e3c34/fuzzer_msan/server.log

```
for i in {1..100}; do clickhouse-client --query "SELECT toUInt8(assumeNotNull(cast(cast(NULL, 'Nullable(String)'), 'Nullable(Enum8(\'Hello\' = 1))')))"; done

160
224
128
192
64
64
32
160
128
192
128
224
128
160
0
96
64
32
192
224
64
96
224
96
128
192
192
128
...
```
if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
            {
                col_null_map_to = ColumnUInt8::create(size, false);
                vec_null_map_to = &col_null_map_to->getData();
            }
            for (size_t i = 0; i < size; ++i)
            {
                if constexpr ((is_big_int_v<FromFieldType> || is_big_int_v<ToFieldType>) &&
                    (std::is_same_v<FromFieldType, UInt128> || std::is_same_v<ToFieldType, UInt128>))
                {
                    if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                    {
                        vec_to[i] = 0;
                        (*vec_null_map_to)[i] = true;
                    }
                    else
                        throw Exception("Unexpected UInt128 to big int conversion", ErrorCodes::NOT_IMPLEMENTED);
                }
                else if constexpr (std::is_same_v<FromDataType, DataTypeUUID> != std::is_same_v<ToDataType, DataTypeUUID>)
                {
                    throw Exception("Conversion between numeric types and UUID is not supported", ErrorCodes::NOT_IMPLEMENTED);
                }
                else
                {
                    if constexpr (IsDataTypeDecimal<FromDataType> || IsDataTypeDecimal<ToDataType>)
                    {
                        if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                        {
                            ToFieldType result;
                            bool convert_result = false;