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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
# List<Int32> -> List<Uint16> (good)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Int32 '1) (Int32 '2) (Int32 '3)))
(let cast (StrictCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))
# List<Int32> -> List<Uint16> (fail)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Int32 '1) (Int32 '-2) (Int32 '3)))
(let cast (StrictCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))
# List<Int32?> -> List<Uint16> (fail)
(let targetType (ListType (DataType 'Uint16)))
(let src (AsList (Just (Int32 '1)) (Null) (Just (Int32 '3))))
(let cast (StrictCast src targetType))
(let world (Write! world res_sink (Key) cast '('('type))))
(let world (Commit! world res_sink))
(return world)
)
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