allow zone format syntax in CLI about denominator HOT 2 OPEN

$TTL 1m
example.com.    IN SOA ns.example.com. whois.example.com. (
                        2009032363      ; serial, todays date + todays serial #
                        2h              ; refresh
                        1h              ; retry
                        30d             ; expire
                        1h )            ; minimum

example.com.  IN  NS    ns.example.com.
example.com.  IN  NS    ns2.example.com.

localhost         IN  A     X.X.X.X
example.com.  IN  A     X.X.X.X
example.com.  IN  MX 10 mx.example.com.
seven.example.com.  IN  MX 10 seven.example.com.
one.example.com.  IN  MX 10 one.example.com.
example.com.  IN  TXT "v=spf1 a mx a:seven.example.com a:three.example.com a:four.example.com a:five.example.com include:gmail.com ~all"
;one.example.com.     IN  A  X.X.X.X
;two.example.com.     IN  A  X.X.X.X
three.example.com.     IN  A  X.X.X.X
four.example.com.   IN  A  X.X.X.X
five.example.com.  IN  A  X.X.X.X
six.example.com.   IN  A  X.X.X.X
seven.example.com.    IN  A  X.X.X.X
control.example.com.        IN  CNAME  control.three.example.com.
trac.one.example.com.       IN  CNAME  trac.seven.example.com.
*.dev.example.com.          IN  CNAME  seven.example.com.
chess.example.com.          IN  CNAME  four.example.com.
haywire.example.com. IN CNAME webmail.example.com. ; Inline comment
; CDN domains
cdn.www.example.com.        IN  CNAME  abc.def.ghi-cdn.com.
cdn.one.example.com.        IN  CNAME  one.def.ghi-cdn.com.
cdn.seven.example.com.       IN  CNAME  one.def.ghi-cdn.com.
ten.cdn.example.com.      IN  CNAME  ten.def.ghi-cdn.com.