In Arduino.h "byte" is typedef'd, but all prototypes except `makeword` use uint8_t, normalize `makeword`

[dok-net]

From the compiler's point of view, it's a non-issue, but for the code reader, it's confusing, not least because the inverse functions lowByte and highByte return type uint8_t, not byte.
Fixed by #414

[WestfW]

"byte" is sort-of for the "beginning user" target audience of the Arduino environment.
Internally, it seems they try to be more technical standards' conformant. That doesn't seem unreasonable to me.