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Well, it's just a bug in the library which means you can still manage with straight RPC over JSON. One thing that can be done is just not use the library for this task. Also, while it is low priority, it's also low hanging fruit. Unlike documentation, it's super easy to review this. If tests are passing (too bad they aren't), then there should be no problem getting this change in.

Still, there haven't been hardly any merges in a long long time and it's really sad. Point being, I wouldn't hold my breath that this gets approved.

Instead, maybe what people would really want is a PR to steemconnect that does this. That way the feature could be offered as a service instead of witnesses having to implement their own. For example, it would be really cool to see this in @steemchiller's steemworld that allowed you to auth over steemconnect.