[Haskell-beginners] splitAt and negative values

[Stayvoid]

Hello,

Could you explain this behaviour?

> splitAt (-1) "Foobar"
("","Foobar")
> splitAt (-100) "Foobar"
("","Foobar")

I don't understand why splitAt (-1) "Foobar" doesn't output this:
("r", "Fooba")
or this:
("", "Fooba")

How does it work?

Python's list slicing looks similar, but results for negative values differ:
>>> a = "Foobar"
>>> a[:-1]
>>> 'Fooba'

Thanks