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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
# Stream<Int32> -> Stream<Uint16> (full)
(let targetType (StreamType (DataType 'Uint16)))
(let src (Iterator (AsList (Int32 '1) (Int32 '2) (Int32 '3))))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) (Collect cast) '('('type))))
# Stream<Int32> -> Stream<Uint16> (less)
(let targetType (StreamType (DataType 'Uint16)))
(let src (Iterator (AsList (Int32 '1) (Int32 '-2) (Int32 '3))))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) (Collect cast) '('('type))))
# Stream<Int32?> -> Stream<Uint16> (less)
(let targetType (StreamType (DataType 'Uint16)))
(let src (Iterator (AsList (Just (Int32 '1)) (Null) (Just (Int32 '3)))))
(let cast (SafeCast src targetType))
(let world (Write! world res_sink (Key) (Collect cast) '('('type))))
(let world (Commit! world res_sink))
(return world)
)
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