Limit to number of arguments to inline C function

Now it gets really strange: This works, but why?

E.getAddressOf(new Int32Array([
                begin, 0, 0, 0, 0, 0, 0, 0,
                end, 0, 0, 0,
                offset,
                stepping
]), true)

Accessing data at index 0, 8, 12 and 13. Any other "configuration" using different 0-spacings does not work. I'm completly lost.