write only property readable after assignment

Should `method3` below be reporting an error?

```js
// @flow

interface WriteType {
-writeOnly: number;
}

function method1(value: WriteType) {
value.writeOnly; // Error
}

function method2(value: WriteType) {
value.writeOnly; // Error
value.writeOnly = 3.14;
}

function method3(value: WriteType) {
value.writeOnly = 3.14;
value.writeOnly; // No Error
}
```