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This pull request is meant to supersede #32 but it wasn't that much a mechanic task.
There have been upstream changes, and the complexity of the code did show: the former caffeination showed some archaic structures (like the
arguments
magic argument that needs to be upgraded to an Array). Also, quite a lot of comments were missing in it so what I did was more or less a review in itself, keeping good changes and reverting obsolete ones while making sure nothing gets lost.