This is why I rage against the crowd that promotes "self documenting code". There's no such thing, even if you should strive to make your code as readable as possible. But if there's a way to misinterpret it then you can bet many people will.
The biggest problem is that this ends up creating so much extra work. An extra 2 seconds from the dev could save hundreds or even thousands of people hours of work. I can't tell you how many hours I've spent chasing stupid shit like your example. I don't know a single programmer who hasn't.
I just don't understand why everyone's frustration with documentation (or lack of) doesn't make obvious the importance of good documentation. Every single one of us has experienced the wasted time and effort that results from the lack of documentation or from low quality docs. Every single one of us has also reaped the benefits of good documentation and seen how much faster it makes us. How does anyone end up convincing themselves that documentation is a waste of time? It feels insane
This kind of bad documentation is actually way more common in teams that require doc comments for all code, which are then promptly auto-generated by the IDE and never filled with actually useful information.
Self documenting code in this case would mean using a type that encodes the unit - which would have the additional benefit that the compiler or other tools can now check correct usage.
You're misinterpreting
Requiring docs isn't the cause of the problem. It's the lack of enforcing quality. The difference is that you're looking at the metric and seeing Goodharts Law in action while there's nothing preventing you from going beyond the metric. That's the real issue is that metrics only take you so far. No metric can be perfectly aligned so it's up to the people who are evaluating the metrics to determine if the letter of the law is being followed or the spirit of it is. If you do the latter then yeah, maybe some functions will be left without docs but you also won't hasn't those tautological docs either. If you only care about the letter of the law then you should expect the laziest bullshit as Goodharts Law always wins out.
Stop reading too much into metrics. Metrics are only guides
Code can show you HOW something is done. Only documentation can explain WHY it is done that way.