Better union #42
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Better union #42
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It's better to evaluate right side only if left side primitive check failed, because only this type of failure means that maybe we have an input that matches right-side specificiation.
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This simplifies evaluation of the union type, so that right side is only applied if the primitive type check on the left side failed. This only works like that if both sides are primitive types, otherwise we must always try to apply both sides.