It's what it has always been; a noun. It's the word that names the place the chicks go to and it's in whatever case it is that defines things gone to.

Yeah but, you cannot replace it with another noun AFAIK. You can replace it with an adverb or a preposition or two.

I just see words changing parts-of-speech-hood at the drop of a clitic. Some languages force you to use derivational morphology is all, but some like Mandarin Chinese and to a slightly lesser extent English let you get away with morpher.

But it's not worth getting hot and bothered about, so I'll let it slide. Heading on out of here or skywards, p'raps.

Ceci n'est pas un seing.