* @return @c -1 if @p bit does not fit into @p vec, @c 1 otherwise.
*/
inline static int bits_setb(uint8_t *vec, size_t size, uint8_t bit)
* @return @c -1 if @p bit does not fit into @p vec, @c 1 otherwise.
*/
inline static int bits_setb(uint8_t *vec, size_t size, uint8_t bit)