cue export hidden.cue
cmp stdout expect-stdout-cue

-- frontmatter.toml --
title = "Hidden Fields"
description = ""
draft = true

-- text.md --
A non-quoted field name that starts with an underscore (`_`) is not
emitted from the output.
To include fields in the configuration that start with an underscore
put them in quotes.

Quoted and non-quoted fields share the same namespace unless they start
with an underscore.

-- hidden.cue --
"_foo": 2
_foo:   3
foo:    4

-- expect-stdout-cue --
{
    "_foo": 2,
    "foo": 4
}