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always disable the builtin hostname verification #526
The summary is that hostname verification is broken in 1.10, and if you do anything other than the default behaviour the stdlib will ruin your day. Now, it might be enough to publish an advisory that says "hey, 1.10 has this bug in it, please avoid upgrading if you rely on this functionality" and then wait for @sigmavirus24. That way we never have a temporary fix in place.