Don't convert JSON arrays to strings #4480
It's meant to handle this case in the spec where long strings are broken by lines: https://nbformat.readthedocs.io/en/latest/format_description.html#display-data (i.e., the multiline string lines, see
I guess the real question here is: have those multiline strings been taken care of at this point in the code. I think so, and in fact it looks like things have been JSON.parsed as well. However, the typing indicates that it is still expecting something that might contain those multiline strings.