Speaking as staff, the ONLY thing I care about is the ":username" portion. Anything else you put (if anything) is at your own discretion.

This helps us track CLAs, commits, and other contributions if we tie them to an account. The account doesn't even have to be your main one. If you want to make "dev_foobar" as your account, that's fine. As long as your CLA is in order, that's all we really care about.