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`final[3]` is `uint8_t`. Integer conversion rank of `uint8_t` is lower than integer conversion rank of `int`, so `uint8_t` got promoted to `int`, which is signed integer type. Shift `final[3]` value left on 24, when leftmost bit is set overflows `int` and it is undefined behaviour. Before this change Undefined Behaviour Sanitizer was unhappy about it with the following message. ``` ../test/unit/hash.c:119:25: runtime error: left shift of 176 by 24 places cannot be represented in type 'int' ``` After this commit problem is gone.