Well, I think that's wrong: the natural incstinct as a programmer is (or should be) to made the code clear and that includes variables that should be readable, consistent vs the code and logical so others (or our future ourselves) will know what the heck was a variable for. Obviously not in a short kata nor in some conditional/bucle sentences but in long programs, right?

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Why doesn't this work?

From the description:

Your algorithm must output the exact integer answer, to full precision. Also, it must correctly handle negative numbers as input.

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Can you not do this mathematically?

One could argue that this can only be done mathematically. If you want a meaningful answer, you should ask a proper question.

Not a kata issue.

Can you not do this mathematically?
OverflowError: (34, 'Numerical result out of range')

actually nvm, I have to check whether or not the negative number is a fibonacci number before returning a negated version of the result else returning the untapped result.

Bro just needed to shorten the variable name just like the natural instinct of any programmer, also I don't know why I got sent a kyu 8 that took me seconds.

Same