Export crashes when many contacts share an address and are merged

When many contacts have matching addresses, exporting them and selecting "Merge All Contacts with the Same Address" crashes cryptically with the "sorry the system is unavailable right now" error. It turns out many addressees combined can exceed the "Addressee" column limits in the temporary search/export table.

[nativecode=1406 ** Data too long for column 'addressee' at row 1]