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Suppressions for `unchecked` or `rawtypes` warnings should have an accompanying
comment to explain why the javac warning is safe to ignore.
Rather than just suppressing the warning:
```java
@SuppressWarnings("unchecked")
public ImmutableList<Object> performScaryCast(ImmutableList<String> strings) {
return (ImmutableList<Object>) (ImmutableList<?>) strings;
}
```
Provide a concise explanation for why it is safe:
```java
@SuppressWarnings("unchecked") // Safe covariant cast, given ImmutableList cannot be added to.
public ImmutableList<Object> performScaryCast(ImmutableList<String> strings) {
return (ImmutableList<Object>) (ImmutableList<?>) strings;
}
```
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