--- self === obj

    Υ᥽åɤϼ case ʸǤӤѤޤ
    obj  self  Object#kind_of? [Object/kind_of?]
    δطˤʤޤĤޤꡢcase Ǥϥ
    ⥸塼ν°طå뤳Ȥˤʤޤ

        str = String.new
        case str
        when String     # String === str ɾ
          p true        # => true
        end

