This is probably why we put so much emphasis on precedent over the actual text of the law. Likewise with the bible, perhaps not as much with the christians at least these days, but the Jews have their talmud that interprets the book ad nauseum through centuries of rabbis spitballing their interpretation of the base text, ending up with things like a string hung from telephone polls to represent the walls of the temple to loophole around sabbath laws.
It's there in Islam too but the interpretive techniques are mostly confined to finding rulings about things that didn't exist back then. eg. Commerce over the internet, Alms calculation on money (as opposed to wealth) etc.
I have heard something about the Jewish history of making these kinds of interpretations to "work around" scriptural laws. I think it was in a book by Israel Shahak where I first came across it.
In any case, yes. Precedent is important and even though it's not fully reliable, we will usually have a lot of stuff that cancels out errors.
