setSync method
Implementation
dynamic setSync(int index, dynamic value) async {
if (_destroyed) throw new Exception("Trying to access a destroyed object.");
if (_suspended) throw new Exception("Trying to access a suspended object.");
if (!_attached) return null;
if (index >= _properties.length)
throw Exception("Property with index `${index}` not found.");
if (_properties[index] == value) return value;
return await set(index, value);
}