Description:
------------
According to the documentation: http://us2.php.net/manual/en/ini.core.php

"Note that to have no memory limit, set this directive to -1."

But the code use more than 4GB virtual memory crashes with "Fatal error: Allowed memory size of -1 bytes exhausted (tried to allocate 605 bytes) in ..." anyway.

Reproduce code:
---------------
<? count(file("a_10GB_file")) ?> // not production code :)
on a machine with enough ram and swap space.


Expected result:
----------------
number of lines in "a_10GB_file".

Actual result:
--------------
"Fatal error: Allowed memory size of -1 bytes exhausted (tried to allocate 605 bytes) in ..."

Suspect that memory limit directive is still a 32bit unsigned integer (size_t) and -1 is converted to 4G-1.