get :: (Flags -> Value -> IO a) -> Failure a
    -> Key -> Handle -> IO a
get success failure key = 
    withRequest opGet key 0 nop 0 nop (CAS 0)
    (getSuccessCallback success failure) failure
get :: (Flags -> Value -> IO a) -> Failure a
    -> Key -> Handle -> IO a
get success failure key = 
    withRequest opGet key 0 nop 0 nop (CAS 0)
    (getSuccessCallback success failure) failure
get success failure key = 
    withRequest opGet key 0 nop 0 nop (CAS 0)
    (getSuccessCallback success failure) failure