Bug Fixes
- core: ensure disabled prop is working for field without key (#3665) (1dd5c6e), closes #3657
- core: ensure observe prop is defined before calling defineProperty (#3666) (d8cafc8), closes #3631
- core: select options pipe has wrong return types (0ff64bc)
- material: add panelClass to mat-select props (#3634) (9b28fc0)