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I stumbled over this statement in your README:
> It is recommended to use .PHONY for targets that are not actual files. In the example below I am not doing that though, but it is wise to follow that rule.
Please also give the example as you think it would be correct. Or write the understandable reason why you don't do it here. I think many people don't read the text between the code snippets but only scan the code examples. It would be helpful to find the ‘best practices’ right there.