@Jo I think your concern regarding maintenance overhead is true, but then it is true for all the software systems. I still maintain that adding the "extra" layer does add some serious benefit. And as for the maintenance, I think that some serious problems would arise when there is an issue of incompatible API (which you said is an exception not a rule). Plus as you pointed out, we can always use a preferred version of modgrammar. So there you have it. If we continue to do so, I don'y think there is any maintenance overhead at all (since we don't change anything). Plus, as for the bug part, I take full responsibility to make the code as bug free as possible.
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