DI: replacing %foo% in config by parameters does not work for array keys

[janmarek]

I tried to configure authenticator service like this:

parameters:
  username: user
  password: 1234

services:
  authenticator: Nette\Security\SimpleAuthenticator({%username%: %password%})

And in generated service factory there was

array('%username%' => 1234)

passed to constructor.

[dg]

In current implementation parameter are expanded quite late and support them in keys is very very difficult. It should be supported if we move expansion immediately after loading file. But it bring BC breaks, see http://forum.nette.org/cs/12881-dependency-injection-v-nette-2-1#p92188