A couple weeks ago, Google has vastly improved their site move documentation, while also updating their mobile smartphone documentation.Alistair Lattimore posted on Google+ asking why the documentation for smartphone guidelines specifically recommends using 302 redirects over 301 redirects? 301s have always been the recommended path for SEO purposes because they pass the best link equity from URL A to URL B.
But no, Google specifically wrote a 302 in the documentation on purpose: