epoll_create wrapper function is not used

[Bran S]

In tests/epoll_create.c:
    const long int size = (long int) 0xdeadbeefffffffffULL;
    long rc = syscall(__NR_epoll_create, size);

Why syscall(__NR_epoll_create) is used when a wrapper function is
available for it in #include <sys/epoll.h>? Are they different in some
way? What is the reason for not using the wrapper?

In manpage of epoll_create there is a line:
"Library support is provided in glibc starting with version 2.3.2."
Is this the reason? So that machines with glibc 2.3.2 can also use this?

Also, why the datatype of size parameter is 'long int'? epoll_create's
prototype has got the size parameter's datatype to be 'int'.