Ensure strings are not enumerated in Ruby 1.8

lib/mustache/generator.rb

@@ -105,7 +105,7 @@ def on_section(name, content, raw)
           Mustache::Template.new(v.call(#{raw.inspect}).to_s).render(ctx.dup)
         else
           # Shortcut when passed non-array
-          v = [v] if v.respond_to?(:has_key?) || !v.respond_to?(:map) || v.is_a?(Struct)
+          v = [v] unless v.is_a?(Array) || defined?(Enumerator) && v.is_a?(Enumerator)
 
           v.map { |h| ctx.push(h); r = #{code}; ctx.pop; r }.join
         end

test/mustache_test.rb

@@ -57,6 +57,15 @@ def test_single_line_sections
     assert_equal %Q'<p class="flash-notice" style="display: none;">', instance.render
   end
 
+  def test_strings_as_sections_do_not_enumerate
+    instance = Mustache.new
+    instance[:contact] = "Call 1-888-FLOWERS\nAsk for Johnson."
+    instance.template = "{{#contact}}<div id='contact'>{{contact}}</div>{{/contact}}"
+
+    assert_equal "<div id='contact'>Call 1-888-FLOWERS\nAsk for Johnson.</div>",
+                 instance.render
+  end
+
   def test_sassy_single_line_sections
     instance = Mustache.new
     instance[:full_time] = true