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 A Name is a collection of Labels. Each label is presentation-formatted
 When a Name is wire-encoded, the label array is walked, and each label is wire-encoded.
 When a Name is unencoded, each label is unencoded, and added to the Name collection of labels.
 When a Name is made from a string, the Name is split into Labels.

++ Creates a new Dnsruby::Name from arg. arg can be :

• Name:: returns arg
• String:: returns a new Name

Returns true if this Name is absolute

Return the canonical form of this name (RFC 4034 section 6.2)

Tests subdomain-of relation : returns true if this name is a subdomain of other.

  domain = Resolv::Name.create("y.z")
  p Resolv::Name.create("w.x.y.z").subdomain_of?(domain) #=> true
  p Resolv::Name.create("x.y.z").subdomain_of?(domain) #=> true
  p Resolv::Name.create("y.z").subdomain_of?(domain) #=> false
  p Resolv::Name.create("z").subdomain_of?(domain) #=> false
  p Resolv::Name.create("x.y.z.").subdomain_of?(domain) #=> false
  p Resolv::Name.create("w.z").subdomain_of?(domain) #=> false

returns the domain name as a string.

The domain name doesn‘t have a trailing dot even if the name object is absolute.

Example :

  p Resolv::Name.create("x.y.z.").to_s #=> "x.y.z"
  p Resolv::Name.create("x.y.z").to_s #=> "x.y.z"

Is this name a wildcard?