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The article was mentioned only a week or so ago, but that is now hundreds of threads back in the list.
daisho.
As far as Google is concern, it certainly read blue-widget as 'blue' and 'widget'. Just for fun, search for "_" {without the quotes}, you will get millions of results but search for "-"{without the quotes}, nothing, nada, zip result. I think that's proof enough how Google treat hyphen and underscore.
But, if you look at the results, most of the results on a search for "_" are dashed URLs.