- Add support for
optionaltype like java8's 'Optional'. - Add support for
extendingsome build-in basic types like 'integer', 'float', 'boolean', 'string', 'array', 'tuple', 'hash'.
optional type like java8's 'Optional'.extending some build-in basic types like 'integer', 'float', 'boolean', 'string', 'array', 'tuple', 'hash'.