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support a "preferred email address" #491
It should be possible for a site to recommend an email address that the user use. One specific use case where this is important is a web app that's been purchased, whereby if the user uses any other email address than the one in the "application receipt", the application won't work.
how to emphasize the "preferred" email address needs UX feedback. What the API looks like is open for discussion, I suggest options to the getVerifiedEmail call (as @michaelrhanson and @benadida have talked about).
One issue that needs to be resolved is precedence when the information provided by the site conflicts with the user's previous behavior (namely, issue #1). I believe that the user's previous behavior should over-ride the preference of the website.