provide stub new-records to force all key removals
provide stub new-records to force all key removals

identification of stale keys has been changed to ignore
keys which don't have all components present in the new
record, to permit partial upserts

this broke deletion which used nil new-records, so now
it uses new-records with all keys but nil values

employeerepublic/er-cassandra,employeerepublic/er-cassandra