CS0019 operator gaps on value-type shims: - Vector2: ==/!=, Vector2*Vector2, Equals/GetHashCode. - Vector4: *float, +/-, ==/!=, Equals/GetHashCode. - Color: ==/!= (Color==Color32 via existing implicit conv), Equals/GetHashCode. - Rect: ==/!=; Matrix4x4: *, GetColumn/GetRow/indexer. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>