I've got a mysterious problem with OAuth accessing https://spi-tools-dev.toolforge.org/.  I have a new feature in beta test, which I'm gating by whitelisting the usernames of my testers.

User:Girth Summit reported being unable to access the feature, and the problem turned out to be that he's apparently being authenticated as "GirthSummit" (no space).  As far as I can tell, that's not a valid username, yet it's what I'm getting back from my django/social-auth authentication flow.  Anybody have any idea what might be going on?

I have three whitelisted users; he's the only one with a space in their username.