Why doesn't on_eof get called on this example?

[Alexander Karelas]

http://stackoverflow.com/questions/24373840/why-isnt-on-eof-called-in-this-anyeventhandle-example

I notice that when there is on on_read function, then on_eof doesn't get 
called when the telnet client connects and immediately disconnects.

However when an $hdl->on_read(sub{ say "READ!" }); statement is 
executed, then the on_eof event gets called even though the on_read 
event never gets called.

So why is on_read needed for on_eof, if it doesn't get executed? Should 
this be in the documentation? Maybe this could be classified as a bug?

- Alex