special unique field content to signal clear field...
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special unique field content to signal clear field on import
There should be some weird special unique field value (like #$@XX) that would never occur as a real value in a data field ... that we could use in an import as a signal to "delete the current data value" for that particular contact record. Having to export the whole set of contacts and then delete them all just to clear some fields in some records seems rather drastic.