Description:
------------
even if you compile everything on 64-bit machine, the code of 
static int mmc_incr_decr(mmc_t *mmc, int cmd, char *key, int key_len, int value, long *number TSRMLS_DC) /* {{{ */

still forces the value to be 32 bit signed integer, even though specification says about 64bit integers

Test script:
---------------
$memcache->increment('whatever',3000000000);

Expected result:
----------------
incrementing by 3 000 000 000

Actual result:
--------------
trying to "increment" by negative value