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This is a sub-issue of.
http://drupal.org/node/1905070. While there are little cleanups planned for the format overall, the current format is a result of months of back and forths, so it should be perfectly fine to apply it more widely to core.introduced the idea of config schema. The changelog leads to (hopefully extensive) documentation on the format at
Create a configuration schema for system.action in system module.
Schema not yet in place