not best practice because magic numbers.
i see 4.54609188 and 1.609344 but
if i was looking at this code for the first time I wouldn't immediately know what they represent.

If I am coding for me its ok to avoid most of the data validation.
I hope most of the members hear for improving the skills and adapt new ideas to be a bug free coding.
When practicing do concentrate in perfection, it’s my vision.

I am sorry to both of you if I heart you in some way.

Just my opinion, but it seems the whole point is to write code for the purpose of passing the tests, so if it passes; it passes. I actually often don't read the description, if it's not necassary. First thing I do is return the inputs to see what I'm given, and what is expected. THEN, I read the description if it's not obvious what to do. This saves me a lot of time. If any requirement is truly a requirement, it should be tested for.
That being said, I do appreciate the hard work of the kata creators, and some descriptions are very clever/funny and have made me laugh out loud at times.

You can't expect the Users to read the description

If the answer ends with a 0, it should be rounded off without the 0. So instead of 5.50, we should get 5.5.

This requirment?

Floating Point rounding errors cause issues passing tests.