Negative numbers not serialized correctly when copying

[seancolsen]

Steps to reproduce

1. Create a new table via data import.

2. Paste the following content to create the table:

   value
   1
   -5
   3

3. Select all cells in the value column and use a keyboard shortcut to copy them.

4. Paste into https://evercoder.github.io/clipboard-inspector/ to inspect your clipboard.

5. Expect the text/plain content to be:

   1
   -5
   3

6. Instead, observe it to be:

   1
   "'-5"
   3

Technical considerations

• We're relying on a third-party library papaparse to do some of the CSV serialization here. It's possible there's a bug in that library. Or it's possible that we're using it incorrectly. Or it's possible the bug is entirely within our codebase. We'll need to troubleshoot this further to isolate it.