Assetic\Factory\AssetFactory::generateAssetName() names output files deterministically. But why not name the output files based on the _contents_ of the static (.js/.css) files?
See also: http://meta.stackoverflow.com/questions/112182/how-does-se-determine-the-css-and-js-version-parameter And yes, I know about assets_version, but this requires something like https://gist.github.com/3947737 to be automatic and useful. Also, it's inefficient. It seems like a much more common reason to want to bust cache is because some static content changed.
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