A while back I was also struggling with understanding the
DependencyExtension. (My razor is often dull. <smile/>)  I was trying to
assure that a particular version of one dependency was not removed after my
bundle/packages were installed.  I came across Rob's advice in the following
link.  Since my scenario also included a third-party dependency (vcruntime)
I concluded that the DependencyExtenstion would not be useful and abandoned
those efforts.  I have not had a chance to try a scenario where I have
multiple co-existent bundles with common packages (all of which I author). 
But reading the code for DependencyExtension it is intended to be a feature
where Burn reference counts a package across multiple bundles, as I
understand it.

http://stackoverflow.com/questions/18603313/how-to-avoid-uninstalling-previously-installed-exepackage-redistributables-whi



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