As mentioned in #5960 (comment), I'm not a fan of optional handling in Typst and the proliferation of default arguments, but given that there is no solution for that in sight, I guess this is still an improvement compared to the status quo. And if we come up with something better, we can deprecate all of them together.

One alternative route would be to return none for not present, but I think that's worse as it means you can't distinguish not present vs. none. (Which is probably how JS ended up with undefined and null, which are the bane of my existence.) It's just a hard problem in dynamic languages as they can't represent Option<Option<T>>.