Generated doc JSON is invalid utf-8

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows WSL

What is the issue affecting?

Other

Expected Behaviour

JSON document output from --doc is standard utf-8 encoding.

Actual Behaviour

When trying to parse the JSON with our site builder, Ruby fails with:

jekyll 3.9.3 | Error:  (/home/rhys/spring/doc/site/_data/doc.json): invalid leading UTF-8 octet at line 1 column 1
/usr/share/rvm/rubies/ruby-3.2.3/lib/ruby/3.2.0/psych/parser.rb:62:in `_native_parse': (/home/rhys/spring/doc/site/_data/doc.json): invalid leading UTF-8 octet at line 1 column 1 (Psych::SyntaxError)
        from /usr/share/rvm/rubies/ruby-3.2.3/lib/ruby/3.2.0/psych/parser.rb:62:in `parse'
        from /usr/share/rvm/gems/ruby-3.2.3/gems/safe_yaml-1.0.5/lib/safe_yaml/load.rb:143:in `load'

Opening the file in VSCode suggests that it is indeed utf-8, but clicking UTF-8 in the footer and then "Save with encoding > UTF-8" reserializes the file and the parser error is cleared.

Sorry I'm not more specific with the error, I don't know a great deal about file formats.

Reproduction steps

1. Export docs
2. Somehow check if they are properly encoded?

Additional Notes

No response

Log File

No response

Start at the documentation export entry point invoked by --doc, then reproduce the export and inspect the first bytes of the generated JSON. The issue is done when the exported document parses successfully as standard UTF-8 in the reported Ruby/Jekyll site builder.