symfony/symfony-docs — pull request #4084 by xabbuh (2014-08-03 07:40:25+00:00)
Title: [Book][Forms] describe the allow_extra_fields form option

| Q | A
| ------------- | ---
| Doc fix? | no
| New docs? | yes (symfony/symfony#8133)
| Applies to | 2.6+
| Fixed tickets | #4082