Yaml library drops comments when round tripping

[justinmchase]

Describe the bug

If I parse a yaml file, edit it then save it back, it drops all comments.

Steps to Reproduce

import {
  parse,
  stringify,
} from "https://deno.land/[email protected]/yaml/mod.ts";

const result = stringify(parse(`
# comment
name: example
`));

console.log(stringify(result)) // name: example

Expected behavior

I expect all code comments to be preserved.

Environment

deno 1.31.3 (release, x86_64-apple-darwin)
v8 11.0.226.19
typescript 4.9.4

• std version: 0.182.0

[justinmchase]

I would propose an option on parse that would return not a basic record but a YamlDocument class object. Add onto the more complex object a full information about tokens. When passed into stringify it would have the full information needed to write the document about out exactly as it came in.