as "type primary" is preferred over "type master" now, it makes sense to make "primaries" available as a synonym too. added a correctness check to ensure "primaries" and "masters" cannot both be used in the same zone.
as "type primary" is preferred over "type master" now, it makes sense to make "primaries" available as a synonym too. added a correctness check to ensure "primaries" and "masters" cannot both be used in the same zone.