hpricot：Hpricot::Traverse#comment?

everyday Ruby 
>> require "hpricot"
=> true
>> doc = Hpricot('<!-- foo1 --><p>foo2</p><!-- foo3 -->')
=> #<Hpricot::Doc {comment "<!-- foo1 -->"} {elem <p> "foo2" </p>} {comment "<!-- foo3 -->"}>
>> doc.search("*")
=> #<Hpricot::Elements[{comment "<!-- foo1 -->"}, {elem <p> "foo2" </p>}, "foo2", {comment "<!-- foo3 -->"}]>
>> doc.search("*").each {|x| p [x, x.comment?] }
[{comment "<!-- foo1 -->"}, true]
[{elem <p> "foo2" </p>}, false]
["foo2", false]
[{comment "<!-- foo3 -->"}, true]
=> #<Hpricot::Elements[{comment "<!-- foo1 -->"}, {elem <p> "foo2" </p>}, "foo2", {comment "<!-- foo3 -->"}]>