alter + preserving dependencies

I have a client who is looking for a way to be able to alter objects 
without having to recreate (say, from a dump) all the objects in a 
possibly large dependency tree rooted at the object. Of course, if the 
alteration invalidates the dependency, than this operation should fail, 
but adding a column to a view or table (which is our most common case) 
should arguably be a benign operation that shouldn't fail because of 
dependencies.

I couldn't see anything in the TODO list that seemed appropriate, in a 
quick scan.

Thoughts?

cheers

andrew

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