What should a (micro)framework include to be considered as such? Do you think this could become a non-experimental development tool?

Some other experiments are these: - Profiler: https://gist.github.com/EmanueleMinotto/5709476 - Exceptions Handlers: https://gist.github.com/EmanueleMinotto/4712920 - PSR-0 autoloader: https://gist.github.com/EmanueleMinotto/4489101 - Configuration: https://gist.github.com/EmanueleMinotto/4489119