Hello debian-devel. I was reading the threads about libpng[23] and glibc/db1 than cause incompatabilities that are hard to describe with debian dependency control fields. And I've got an idea.
What about adding one more field with the following semantics. If package P has FirstCompatable: N in it's control, then P should conflict with any package that depends on P and allows P version to be lower than N. Than means, any package that depends on P should depend on P (>> M), where M>=N. This should solve the situation when newer version of package is incompatable with the previous. E.g. if it provides a library that links with libpng3, and the previous version linked with libpng2, and changing soname is a bad idea for somereason. Sorry if the idea in silly or not new.
