FuseToMaybe

Type Parameters:

T - the value type

All Known Implementing Classes:

MaybeIgnoreElementCompletable, MaybeIsEmptySingle
```
public interface FuseToMaybe<@NonNull T>
```
Interface indicating an operator implementation can be macro-fused back to Maybe in case the operator goes from Maybe to some other reactive type and then the sequence calls for toMaybe again:
```
 
 Single<Integer> single = Maybe.just(1).isEmpty();
 Maybe<Integer> maybe = single.toMaybe();
 
 
```
The Single.toMaybe() will check for this interface and call the fuseToMaybe() to return a Maybe which could be the Maybe-specific implementation of isEmpty().
This causes a slight overhead in assembly time (1 instanceof check, 1 operator allocation and 1 dropped operator) but does not incur the conversion overhead at runtime.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  @NonNull Maybe<T> fuseToMaybe()
  Returns a (direct) Maybe for the operator.

- Method Detail
  - fuseToMaybe
```
@NonNull
@NonNull Maybe<T> fuseToMaybe()
```
    Returns a (direct) Maybe for the operator.
    The implementation should handle the necessary RxJavaPlugins wrapping.
    
    Returns:
    
    the Maybe instance