readline: No way to completely unhook interface from input/output

[isaacs]

If you create a readline interface, there is no way to remove the event listeners it attaches to its input and output streams.

This can lead to memory leaks, but it also makes it difficult to have a readline interface just for a little while, and then remove it so that some other readline interface can use the same input stream or output stream. They end up getting all mixed up.