symfony/dependency-injection + (2) -

    (sorry for pinging reviewers, switching branch trigger that)
    Sorry for opening this so lately... I just realized that we could get rid of `Yaml::PARSE_KEYS_AS_STRINGS` just by recommending using quotes...
    I've messed up the return value of parseDefaults under certain conditions in #21342. Here is the fix... Sorry about that.
    @fabpot I know I keep insisting on this one and I am sorry for that but I think this should be considered as a bug fix (see the PR header for details) and should be merged in 2.2. I think the Symfony core should be exemplary as it is used by many developers as a template when creating their own bundle. *This PR is no more a WIP and can be merged right now*.
    sorry but i dont understand what you suggest. more over i dont see the problem. its already possible to seriously break stuff with compiler passes which cannot be easily enabled/disabled. this is just convenience. if it doesnt work because of some obscure combo then simply dont use it for the app since it needs to be explicitly enabled in the kernel.
    The example, sorry :smiley: