Cast #236
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Cast #236
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This PR implements a more sophisticated scoring scheme for union resolution during casting. The updated algorithm now factors proportional property scoring, property existence checks and biasing for matching literal const values.
This PR also includes a new
Type.Never()type which was introduced in this PR to express empty unions, as these were catching on casting logic. This type is also to serve as new type infrastructure for planned future work onType.Intersect()and a newType.Evaluate()function which will need to evaluate to never for certain kinds of type composition.