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(

(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))

# List<Int32> -> List<Uint16> (full)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Int32 '1) (Int32 '2) (Int32 '3)))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))

# List<Int32> -> List<Uint16> (less)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Int32 '1) (Int32 '-2) (Int32 '3)))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))

# List<Int32?> -> List<Uint16> (less)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Just (Int32 '1)) (Null) (Just (Int32 '3))))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))

(let world (Commit! world res_sink))

(return world)

)