From the firebase-talk group:
Unfortunately, we are not sending a debug version of the 3.xx client. The reasons for this are a bit complicated, but it concerns how we create the SDK itself. We hope to return the debug version of the SDK in a future version, although at this point I do not have a time estimate. Sorry, I have nothing to use. I would love to hear your use cases (other than using it for debugging) if you have them
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