Tag helper should output an attribute with the value 'false' instead of omitting the attribute, if the associated option is false but not nil.

actionpack/lib/action_view/helpers/tag_helper.rb

@@ -133,10 +133,12 @@ module ActionView
           unless options.blank?
             attrs = []
             if escape
-              options.each do |key, value|
-                next unless value
-                value = BOOLEAN_ATTRIBUTES.include?(key) ? key : escape_once(value)
-                attrs << %(#{key}="#{value}")
+              options.each_pair do |key, value|
+                if BOOLEAN_ATTRIBUTES.include?(key)
+                  attrs << %(#{key}="#{key}") if value
+                else
+                  attrs << %(#{key}="#{escape_once(value)}") if !value.nil?
+                end
               end
             else
               attrs = options.map { |key, value| %(#{key}="#{value}") }

actionpack/test/template/form_tag_helper_test.rb

@@ -235,7 +235,7 @@ class FormTagHelperTest < ActionView::TestCase
     assert_match VALID_HTML_ID, label_elem['for']
   end
 
-  def test_boolean_optios
+  def test_boolean_options
     assert_dom_equal %(<input checked="checked" disabled="disabled" id="admin" name="admin" readonly="readonly" type="checkbox" value="1" />), check_box_tag("admin", 1, true, 'disabled' => true, :readonly => "yes")
     assert_dom_equal %(<input checked="checked" id="admin" name="admin" type="checkbox" value="1" />), check_box_tag("admin", 1, true, :disabled => false, :readonly => nil)
     assert_dom_equal %(<select id="people" multiple="multiple" name="people[]"><option>david</option></select>), select_tag("people", "<option>david</option>", :multiple => true)

actionpack/test/template/tag_helper_test.rb

@@ -19,6 +19,10 @@ class TagHelperTest < ActionView::TestCase
     assert_equal "<p />", tag("p", :ignored => nil)
   end
 
+  def test_tag_options_accepts_false_option
+    assert_equal "<p value=\"false\" />", tag("p", :value => false)
+  end
+
   def test_tag_options_accepts_blank_option
     assert_equal "<p included=\"\" />", tag("p", :included => '')
   end