Cunning! CSV export of an address book silently drops just certain multi-value field entries of your contact data, and you may never notice... (seen on 102.4.0 (64-bit), Win10).

STR

1. Have some contacts in a (local) address book with more than two values for a field, e.g. 3 email addresses, third one may be 3333@example.com.
2. Right-click on the (local) AB, select Export..., and save as my-ab.csv.
3. Inspect my-ab.csv file with text editor and search for 3333@example.coom.

Actual

• 3333@example.coom is not found in the csv file, which probably means that:
• All multiple field values which don't fit into the old AB scheme have been lost in the csv file.
• If we dig hard enough, we might find more fails.

Expected

• Don't silently lose data on export. Wanting AB data as csv is a perfectly valid and useful scenario. Should be possible to create more numbered column headers for the first row like email3, email4 etc. Although this would require parsing all such multi-value data of all contacts before the export to know how many commas we need to fill for the others. Hmmm.
• Warn the user against such dataloss if we cannot or until we do better.

Even though bug 1331246 was filed against the old AB, much of that might still apply, so we should check that, too.