For consistency, this meant making a few changes:
- Renamed the existing lazy mapping method to lazyMap, to indicate that it doesn't run the mapping immediately.
- Added a new implementation of map(), which returns Optional<T>, and resolves the value in the process.
- Changed filter() to return Optional, since there's no way to filter lazily.
- Added a new method resolve(), which helps convert the custom LazyOptional class into a standard Optional, for use
with library methods that expect Optional<T>.
* Update License headers.
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