> Ughm, is there any study that shows that guardrails and lights on bridges reduce fatalities?

> Akshually, are there any studies showing that cars riding 30 km/h kill less people than cars that ride 80 km/h?

Newsflash: not everything good has a study about it

Well, it's just a documentation suggestion for user. Having for me about same value as if it was written in pydoc. I'd really love to see such study as well

it has been consensus for decades at this point.

That's equivalent to asking if there are benefits of static typing.