Does Passing Contact Information send hidden fields to TY page URL?

I want to pass a value from a hidden custom field captured on an optin page to the thank you page, using a Web Address thank you page with the ‘Redirect to thank-you page’ option selected.

If I check the box to ‘Pass contact’s information to the thank-you page,’ will it pass the hidden field value as a query parameter in the URL, or just the name/email/contact id values?