[nijk]

That is a lie. Some of the arguments are provided as global variables like $_, (no need to remember its name, since its value will be implicitly used whenever you omit a necessary argument) whose value is decided by something akin to Clippy choosing what seems most handy.

[kbenson]

$_ is not global, it's lexical. It's value is not haphazardly chosen, it is the topic for structures that topicalize.

You seem to be proving what I said earlier[1]. You think you understand what's going on, but in truth you don't. Feel free to continue making assertions regarding things you don't know, I can't stop you, but be aware that to do so is dishonest.

[1]: https://news.ycombinator.com/item?id=5657901

[Mithaldu]

$_ is very clearly and sharply defined. Only because you never took even a slightly look at the documentation does not mean you should just make up things. :)