What's a bool?

a word bloods use, it's basically "Cool" with the "C" replaced by a "B"

aye them niggaz are bool as fuck

This is why we have better standard libraries than C, to ensure that the compiler is aware of what's going on and can have a well tested implementation. As opposed to leaving the low level common shit to the programmer to reimplement per project with hacks that may or may not optimize as intended.