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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
# result is true for all tests below
# Int32 -> Uint64?? (false)
(let value (Int32 '"-1"))
(let commonType (OptionalType (OptionalType (DataType 'Uint64))))
(let imlicitEqualsResult (Exists (StrictCast value commonType)))
(let world (Write! world res_sink (Key) imlicitEqualsResult '('('type))))
# Just(Int32) -> Uint64?? (false)
(let value (Just (Int32 '"-1")))
(let commonType (OptionalType (OptionalType (DataType 'Uint64))))
(let imlicitEqualsResult (Exists (StrictCast value commonType)))
(let world (Write! world res_sink (Key) imlicitEqualsResult '('('type))))
# Nothing(Int32)? -> Uint64?? (true)
(let value (Just (Nothing (OptionalType (DataType 'Int32)))))
(let commonType (OptionalType (OptionalType (DataType 'Uint64))))
(let imlicitEqualsResult (Exists (StrictCast value commonType)))
(let world (Write! world res_sink (Key) imlicitEqualsResult '('('type))))
(let world (Commit! world res_sink))
(return world)
)
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