Unity.mathmatics half2 missing operator + and operator +=

Likely missing more, but:

Code (CSharp):

1. half2 one = new half2(1,1);
2. half2 two = new half2(1,1);
3.  
4. half2 result = one + two; // won't compile
5. one += two; // won't compile
6.  
7. half2 result2 = new half2(one.x + two.x, one.y + two.y); // compiles.
8.