Integer Promotions

Types smaller than `int` (char, short, bit-fields) are converted to `int` before arithmetic.

Intermediate

uint8_t a = 200, b = 100;
uint8_t c = a + b;   /* computed as int 300, then truncated to 44 */

This explains many surprising results with uint8_t and bitwise NOT: ~(uint8_t)0 is -1 as an int.

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