symfony/symfony — pull request #7307 by tPl0ch (2013-03-08 15:51:40+00:00)
Title: [DependencyInjection] Added '@@' escaping strategy for YamlFileLoader and YamlDumper

Added the possibility to to use '@@' as an escaping strategy for
parameters that should be treated as strings but start with '@'
(i.e. safe mailer passwords).

I took the '@@' approach from the '%%' escaping strategy and thought
that would fit best, but I leave it open for discussion.