Yes, there are heuristics given. Except, until clean code, it was not common to even see "use good names" as a principle. In the bad times, pre 2000, a lot of c

Yes, there are heuristics given. Except, until clean code, it was not common to even see "use good names" as a principle. In the bad times, pre 2000, a lot of code was just focused on getting it right. The: then make it clean, then fast (in that order)" was not a thing. In those bad times, the idea of spending time on naming, that naming was even important - was not a widespread thing. The idea that naming all the way down to variables was important - was popularized by Clean Code. Which is to say, the idea to emphasize and care about naming was not widespread at the time, let alone how to do it.