> Sorry, but we don't allow subclassing of protocol buffer objects (in any
> language).  Allowing this leads to too many "fragile base class" problems.

Sorry to bring up an old topic again, and I know it's discouraged, but
I was wondering if there would be any incompatibilities if the
subclass would remain very simple, simply adding a couple of custom
member variables and otherwise only calling public functions in its
own functions.  Are there any binary structure dependencies that I'm
not thinking of that would be broken(like the offsets table), or would
this be a conservative enough subclassing?
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