Make internal class final.
Make Lookup more lazy.
Add tests of Lookup.
Modify tests of Lookup.
Modify javadoc of toLookup.
Correct javadoc mistake of toMap.
Fix issue double generator and float generator returns NaN.
Refactoring: user factory.
Refactoring: user factory.
Refactoring: user factory.
Refactoring: rename internal class.
Refactoring: use factory method for positional filtering.
Refactoring: rename.
Refactoring: use factory method for positional mapping.
Make internal class final.
Refactoring: use factory method for positional mapping.
Refactoring: use factory method for positional filtering.
Remove unnecessary inheritance.
Change message of exception.
Modify javadoc.