If you use int16_t for a variable you know it’s 16 bits, regardless of which Arduino is being targeted. int8_t/uint8_t - a signed/unsigned type that is exactly 8 bits in size. int16_t/uint16_t ...

It can also examine and set global variables that you preconfigure and ... one for 8-bit AVR processors and another for other Arduino types. We found problems building both of them.