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The new pseudo-variables ".FILE", ".LINE" and ".SECTION" will be resolved on the fly by the config parser and will respectively retrieve the current configuration file name, the current line number and the current section being parsed. This may help emit logs, errors, and debugging information (e.g. which rule matched). The '.' in the first char was reserved for such pseudo-variables and no other variable is permitted. This will allow to add support for new ones in the future if they prove to be useful (e.g. randoms/uuid for secret keying or automatic naming of configuration objects).