R_API bool r_is_heap (void *p) {
	void *q = malloc (8);
	ut64 mask = UT64_MAX;
	ut64 addr = (ut64)(size_t)q;
	addr >>= 16;
	addr <<= 16;
	mask >>= 16;
	mask <<= 16;
	free (q);
	return (((ut64)(size_t)p) == mask);
}