Silently ignore re-pushed packages?

We are doing .NET development of an in-house system. We’re using nuget packages to share modules between a set of Visual Studio solutions and ProGet has been working great so far.

We are using TeamCity for CI, and it is building and pushing our nuget packages on each build. Since there are several independent packages in a solution we are manually controlling the package version by incrementing it when we make changes to a given package. This also means that all packages that are not changed will still be built as part of the solution and TeamCity will be re-pushing the same version of the packages every time. I have enabled the Feeds_OverwritePackage permission to avoid errors. The only problem we have with this is that if someone forgets to increment the version number when they make changes the package will be overwritten in the feed. And now there are differing packages in use with the exact same version number.

My question is then, is there any way to have ProGet silently discard re-pushed packages instead of overwriting?

Or even better, to fail in the case where the package has the same version and different content, and ignore the pushes where the content is the same except for file-dates and such since the package is re-built from the same source.

Product: ProGet
Version: 2.2.13

This is not a very common scenario, so I would suggest altering your workflow to not always update the packages if they don't change.

Alternatively you'll need to add some custom steps such as deleting the package before pushing it, or using a custom package store.