There is no reason for "real" github accounts to be marked as mannequins.
IIRC, when Python.org made a move to GitHub, they only mapped to mannequins
old accounts of people for whom they didn't know a corresponding GutHub account.
(we map such accounts to "sagetrac-<trac acct name>").
But here we do know.
Whether the account owner accepts an invite to be on a sagemath org
team, is quite an orthogonal issue.
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