extract checked_value and unchecked_value before passing options to t…

…he check_box helper so as not to make them attributes of the resulting input HTML element

lib/formtastic.rb

@@ -1205,9 +1205,11 @@ def boolean_input(method, options)
         html_options = options.delete(:input_html) || {}
         checked = options.key?(:checked) ? options[:checked] : options[:selected]
         html_options[:checked] = checked == true if [:selected, :checked].any? { |k| options.key?(k) }
+        checked_value = options.delete(:checked_value) || '1'
+        unchecked_value = options.delete(:unchecked_value) || '0'
 
         input = self.check_box(method, strip_formtastic_options(options).merge(html_options),
-                               options.delete(:checked_value) || '1', options.delete(:unchecked_value) || '0')
+                               checked_value, unchecked_value)
         options = options_for_label(options)
 
         # the label() method will insert this nested input into the label at the last minute

spec/inputs/boolean_input_spec.rb

@@ -38,7 +38,7 @@
       concat(builder.input(:allow_comments, :as => :boolean, :checked_value => 'checked', :unchecked_value => 'unchecked'))
     end
 
-    output_buffer.should have_tag('form li label input[@type="checkbox"][@value="checked"]')
+    output_buffer.should have_tag('form li label input[@type="checkbox"][@value="checked"]:not([@unchecked_value][@checked_value])')
     output_buffer.should have_tag('form li label input[@type="hidden"][@value="unchecked"]')
   end