I don't really like the prefixed '_' ... agree with the previous comment that ::Abstract (or similar) would be a better option.
I also agree that naming things properly (not just modules, actually variables and methods are probably more important), is extremely important, and often overlooked by novice programmers. It can make code substantially easier to read. Sometimes a good name is not obvious, and it requires some thought. It's also important to rename things (despite the maintenance overhead) when it's purpose changes, or a better name becomes apparent.
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