Description:
------------
I would expect content set with Memcache::set to be not compressed unless the flag MEMCACHE_COMPRESSED is set. But the content is always compressed.

Memcache Version:3.0.4
PHP Version: 5.3.6 (cli)(could not enter this version in bug tracking)
Memcached Server Version: 1.4.4
OS: Linux ip-10-58-149-116 2.6.35.11-83.9.amzn1.x86_64 #1 SMP Sat Feb 19 23:42:04 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Testcontent: The first 512K of http://dumps.wikimedia.org/enwiki/latest/enwiki-latest-abstract1.xml

Compression:
[ec2-user@ip-10-58-149-116 ~]$ ls -lh wiki.txt
-rw-rw-r-- 1 ec2-user ec2-user 512K Apr  4 16:54 wiki.txt
[ec2-user@ip-10-58-149-116 ~]$ gzip wiki.txt
[ec2-user@ip-10-58-149-116 ~]$ ls -lh wiki.txt.gz
-rw-rw-r-- 1 ec2-user ec2-user 68K Apr  4 16:54 wiki.txt.gz

Reproduce code:
---------------
<?php
$memcache = new Memcache;
$memcache->connect('localhost', 11211) or die ("Could not connect");

$version = $memcache->getVersion();
echo "Server's version: ".$version."<br/>\n";

$stat = $memcache->getStats();
echo $stat['bytes']."\n"; //expect 0

$memcache->set("wiki_uncompressed", file_get_contents("wiki.txt"), false, 360) or die ("Failed to save data at the server");
$stat = $memcache->getStats();
echo $stat['bytes']."\n"; //expect ~524 288

$memcache->set("wiki_compressed", file_get_contents("wiki.txt"), MEMCACHE_COMPRESSED, 360) or die ("Failed to save data at the server");
$stat = $memcache->getStats();
echo $stat['bytes']."\n"; //expect less then 1 000 000


Expected result:
----------------
Server's version: 1.4.4<br/>
0
524288
593525

Actual result:
--------------
Server's version: 1.4.4<br/>
0
69237
138472