ep-engine crashes with assertion when on 32-bit machine more then 2Gig data size is reached

I have amd64 kernel but 32-bit userspace. So I can easily have 32-bit processes using full 4g of 32-bit address space. But setting bucket size to 3G and loading data I got memcached into state where it continuously fails with assertion:

Thread debugging using libthread_db enabled]
Core was generated by `/root/src/altoros/moxi/repo20/install/bin/memcached.orig -u root -X /root/src/a'.
Program terminated with signal 6, Aborted.
#0 0xf7717430 in __kernel_vsyscall ()
(gdb) bt
#0 0xf7717430 in __kernel_vsyscall ()
#1 0xf7528941 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2 0xf752bd72 in *__GI_abort () at abort.c:92
#3 0xf7521b58 in *_GI__assert_fail (assertion=0xf3ab362c "stats.currentSize.get() < ((size_t)1<<(sizeof(size_t)*8-1))", file=0xf3abfb93 "objectregistry.cc", line=55,
function=0xf3abfc20 "static void ObjectRegistry::onCreateBlob(Blob*)") at assert.c:81
#4 0xf3a1adc9 in ObjectRegistry::onCreateBlob (blob=0x1f5ec618) at objectregistry.cc:55
#5 0xf39b085d in Blob (this=<optimized out>, len=1024) at item.hh:116
#6 New (len=1024) at item.hh:60

My guess is that some variables are signed there and 32-bit.

ep-engine should not allow that. And/or ns_server should not allow that either.