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I'm not entirely sure what the plan going forward for mobile is going to be re obfs4. At this point to get obfs4 on mobile, it would either require adding obfs4 to obfsclient (doable, but a decent amount of work), or adding ScrambleSuit to obfs4client.

Assuming golang is easy to compile and run on mobile I'm inclined to do the latter since obfs4proxy is memory safe, fully supports #8402 (moved), and this would reduce obfsproxy in Tor Browser to "there so fte works".

In practical terms the work required for this isn't massive (at least for client support), due to how close obfs4 and ScrambleSuit are under the hood.