Zend framework outputting the letter 'f' onto my page

Question

I've downloaded the Zend framework stable build (1.11, I believe), uploaded to my servers, and added it to my php include path.

My goal is to use the Feed and Feed_Writer modules to handle some RSS and Atom heavy lifting.

The problem is that whenever I include the Feed_Writer file, I get a random f that shows up at the beginning of my document.

require('Zend/Feed.php');
require('Zend/Feed/Writer/Feed.php');

will result in the f, but doesn't throw a fatal when I instantiate a Zend_Feed_Writer_Feed

require('Zend/Feed.php');

will not result in the f, but does throw a fatal when I instatiate a Zend_Feed_Writer_Feed

I'm new to the Zend framework, is this some sort of mysterious error code? If so, is there a reference for these sort of things? "Zend f" and "Zend output f" and "Zend echo f" are not particularly google friendly.

EDIT

Here is some source that is dumbed down from mine, but still exhibits the error

<?php
require('Zend/Feed.php');
require('Zend/Feed/Writer/Feed.php');

$feed = new Zend_Feed_Writer_Feed;
echo 'hi'
?>

The output from this is fhi

EDIT 2

Thanks to @Drew010 for the answer. Here's the little f

Answer 1

This issue is fixed in ZF 1.11.12, there was a bug where an f was accidentally placed at the beginning of the file Zend/Feed/Writer/Deleted.php.

Bug report is here. You can safely delete the f from the beginning of the file, or use the 1.11.12 release.