What does a keyword do?

[quovadis1234]

In this section, it says that CUE reserves all identifiers starting with __(double underscores) as keywords.
In which case I could use an identifier starting with __, can you show me an example?

[verdverm]

https://github.com/cue-lang/cue/search?q=__ looks to have some breadcrumbs. As I understand it, they are largely internal and you shouldn't see them as a user.

You can use quotes to have labels which contain special chars

"#def": "not really a definition"
"_hid": "not really hidden"
"__foo": "not really a reserved identifier"

https://cuelang.org/play/?id=ysVprjTceqV#cue@export@json

[myitcv]

Thanks @verdverm.

@quovadis1234 - I converted your issue to be a discussion as it's a better fit.