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Thanks for the patch, I committed it as r53774. I made a few modifications, like adding the return statement and guessing what the NetBSD support could be; I was not able to test any of this.
As for documentation and test suite changes: I'm willing to waive them. The bluetooth sockets are not documented at all so far, and testing them would only be possible if you have the hardware. I guess users will tell us if this is correct or whether something is missing.