What is going on here? Is one of the implementations wrong(as in not following the IEEE-specified result)? Both? I mean, ideally, floating point algorithms wo

What is going on here? Is one of the implementations wrong(as in not following the IEEE-specified result)? Both? I mean, ideally, floating point algorithms would have ranges they tolerate but if they are going to expect bit-perfect results, I think the specs should have them covered assuming the implementation is compliant. I see the GitHub mentions sin(x). I have never dug so deep. Are trigonometric functions left as an exercise to the reader?