For anyone wondering: double -> uintx_t is indeed undefined in C and C++ for values outside of (0, UINTx_MAX), which is kind of a gotcha since, double -> long -

For anyone wondering: double -> uintx_t is indeed undefined in C and C++ for values outside of (0, UINTx_MAX), which is kind of a gotcha since, double -> long -> uint8_t is fine (assuming all integer parts of double fit in a long).