fails:SizedQueue#enq with a timeout does nothing if the timeout is nil
fails:SizedQueue#enq with a timeout returns nil if no space is avialable and timeout is 0
fails:SizedQueue#enq with a timeout returns nil if no space is available in time
fails:SizedQueue#enq with a timeout raise TypeError if timeout is not a valid numeric
fails:SizedQueue#enq with a timeout raise ArgumentError if non_block = true is passed too
fails:SizedQueue operations with timeout fails if string is provided
fails:SizedQueue operations with timeout fails if boolean is provided
