I strongly suggest that the greet call uses a slightly different syntax (e.g. two dots) as the system otherwise can't introduce new keywords without risking conflict with function names in existing documents.
Does it need more keywords? This syntax reminds me of Smalltalk syntax a little and Smalltalk famously got away with merely 6 keywords. I didn't check the syntax in detail for quarkdown, and I don't expect it to be as well thought out as Smalltalk, but it is quite possible to get away with only few keywords. Question is then how complete their concept is right now. Also there could be a versioning mechanism, that labels a document as for a specific version of Quarkdown.
if you have a UDF called .until and then this becomes a keyword, does the new 3rd party library you start using that uses the keyword .until still work, and what does the LLM vibe-coded start doing in the future when it makes use of the .until keyword?
