From: KOSAKI Motohiro <kosaki.motohiro@...>
Date: 2011-08-28T14:55:15+09:00
Subject: [ruby-core:39157] Re: [Ruby 1.9 - Bug #5237] IO.copy_stream calls #read on an object infinitely many times

>> The class that implements an IO#read-like method without clearing
>> the destination buffer on EOF is arguably broken, but infinite
>> looping is bad, I think.
>
> Ah, you are right, it really should replace buffer with "" (according
> to the code) and return nil according to the docs. Seems more than a
> little weird, however, to empty the buffer to signal EOF, especially
> since the buffer argument is optional.

I'm curious. Which doc do you talk about?