Can you reformat this a bit, maybe like:

```
// Converts a sequence into an eager sequence.
//
// An eager sequence fully evaluates all of its values immediately. Sequences
// derived from an eager sequence will also be eager.
//
// Returns a new eager sequence, or the receiver if the sequence is already
// eager.
```

"Lazy by default" would probably go better [in the class description](https://github.com/EnthusiasticCode/ReactiveCocoa/blob/90b313e018c8874051b8b8e18b66c502e3024226/ReactiveCocoaFramework/ReactiveCocoa/RACSequence.h#L15).