code: def eq(query_string, options = {:case_sensitive => false})
        do_comparison(query_string, options) do |comparator, item|
          comparator == item
        end
      end
docs: performs strict equality comparison.
  
   If arguments are strings, they are, by default,
   compared case-insensitive, if case-sensitivity
   is required, use:
  
   eq('something', :case_sensitive => true)