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Need to find the existing ones, and fix them.
There was also some talk of modifying gems pushed to us...I think it was related to this. @evanphx @drbrain do you remember?
What I want to do is, once we feel confident that rubygems is no longer creating bad YAML ever, we start detecting bad YAML and rejecting the push with a message that says "please upgraded to the most recent rubygems release".