UIKeyboardHIDUsageKeyboard missing left/right command keys

For keyboard handling on iOS (and iOS on macOS M1), the iOS 13.4 keyboard constants are missing the command keys. We need to be able to detect key up/down on all the modifiers. I realize there's a modifiers field on UIKey, but this seems inconsistent.

      case UIKeyboardHIDUsageKeyboardLeftShift: b = kButton_Shift; break;
			case UIKeyboardHIDUsageKeyboardRightShift: b = kButton_Shift; break;
			case UIKeyboardHIDUsageKeyboardLeftAlt: b = kButton_Alt; break;
			case UIKeyboardHIDUsageKeyboardRightAlt: b = kButton_Alt; break;
			// ? case kVK_Command: b = kButton_Command; break;
			// ? case kVK_RightCommand: b = kButton_Command; break;
			case UIKeyboardHIDUsageKeyboardLeftControl: b = kButton_Ctrl; break;
			case UIKeyboardHIDUsageKeyboardRightControl: b = kButton_Ctrl; break;