I already know -- you told us so -- that if I had transitivity as you wish it (uncontrollable, unstoppable, always-on) I could not any more write and register a perfectly reasonable adapter which fills in with a NULL an optional field in the adapted-to interface, without facing undetected degradation of information quality by that adapter being invisibly, uncontrollably chained up with another -- no error message, no nothing, no way to stop this -- just because a direct adapter wasn't correctly written and registered.
But why would you *want* to do this, instead of just explicitly converting? That's what I don't understand. If I were writing such a converter, I wouldn't want to register it for ANY implicit conversion, even if it was non-transitive!
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