Maybe a new command like "DELSYNC" should be added that acts like the current DEL behavior, and in a future version DEL could be changed to act like UNLINK?
Async in Redis is the exception, so I don't think delsync is necessary. DELASYNC doesn't sound bad though, assuming the functionality is exactly the same, but async.
For what little my opinion matters, I agree it would be clearer if the name helped to indicate that the semantics are the same except it's just an asynchronous DEL. Better than relying on a reference to unix semantics, no?
