phone based dedupe rule fails to match when importing

If:

• you create a dedupe rule that just matches on phone number.
• do an import with a record that has a phone number matching a phone number of a contact in the database
• specify that you want to update on duplicate match
• specify the phone number only de-dupe rule

Then... the new record will be imported and will not match the existing record.

That seems to be because it will be imported matching the "phone" field - but the dedupe rule is looking for the phone_numeric record.