Default arguments are faked via an extra function or constructor with an extra

Int

as the first argument that's basically a bitset of parameters that were actually passed.

weird, I'd have automatically created another constructor.. anyway, I just done it manually and it works, thanks

That gets out of hand quickly if you have a couple of default parameters, and it doesn't work at all when they overlap.

indeed

Maybe they could have gone with a factory function but that probably complicates reflection a lot.

yeah, I guess so