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Unfortunately this can't be implemented "above the vtable" because various operating systems don't provide low level DNS resolution primitives such as just putting the list of nameservers in a file. Without libc on Linux it works great though! Anyway this also changes the API to be based on Io.Queue. By using a large enough buffer, reusable code can be written that does not require concurrent, yet takes advantage of responding to DNS queries as they come in. I sketched out a new implementation of `HostName.connect` to demonstrate this, but it will require an additional API (`Io.Select`) to be implemented in a future commit. This commit also introduces "uncancelable" variants for mutex locking, waiting on a condition, and putting items into a queue.