WOW

Leaving a comment to come back later to try to figure out what is happening here

Cool 😎

oh..I never know we can assign multiple name to function :O

wow

can you explain this code please;

Well, it definitely seems to pass all the tests. :]

This kata is turning out much more interesting than I imagined when I first clicked on it. There are just so many different solutions. And you may have found the simplest. I don't think it can be done in less than three comparisons.

Yes, it is more clear for me now.

oh I see, is it ok now?

I read it as "no (repeating or zero integer roots)". Also "zero integer roots" reads like "it should have at least one integer root".

I don't get it, the current description already states "integer roots"

Description was not clear for me. I would suggest to change it to

Let's call this polynomial compact if it has only integer roots which are non-repeating and non-zero and ...

Currently it sounds like real and complex roots are ok.

Try not to use floating point arithmetic.