Quarto front matter expects ending with --- while pandoc allows ...

I'm asking if Quarto is supposed to allow ending the frontmatter with ....
(Because it makes it possible for me to modify the frontmatter with standard yaml libraries.)

Your answer above is "Yes", because Pandoc allows this. Great :-)

Unfortunately Quarto throws an error. Should I file a bug report?

Expected front matter to end with '---'

Error: Expected front matter to end with '---'
    at validateDocumentFromSource (file:///opt/quarto/bin/quarto.js:84346:19)
    at async renderFiles (file:///opt/quarto/bin/quarto.js:86587:55)
    at async render (file:///opt/quarto/bin/quarto.js:90681:21)
    at async renderForPreview (file:///opt/quarto/bin/quarto.js:102415:26)
    at async render (file:///opt/quarto/bin/quarto.js:102310:20)
    at async Object.promise (file:///opt/quarto/bin/quarto.js:102466:33)

Originally posted by @th0ger in https://github.com/quarto-dev/quarto-cli/discussions/6687#discussioncomment-6896517

cc @cscheid