Cool!

just test it so that you make sure you don't loose out on the conversion.

Maybe the following C program will tell you the type sizes provided you manage to compile it:

#include <stdio.h>
#include <libperfstat.h>

int main(void){
        printf("double: %d bytes\n", sizeof(double));
        printf("u_longlong_t: %d bytes\n", sizeof(u_longlong_t));
        printf("unsigned long long: %d bytes\n", sizeof(unsigned long 
+long));
        return(0);
}
[download]

Note: others here who do know the internals of Perl may have a better solution, if your application is critical.

bw, bliako