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Chris Tate
d68a705975
A checked cast into a union whose discriminant has four or more string literals reads the discriminant field once (scr_dyn_discriminant_case) and then tests only the arms whose literal it holds and the arms without a literal, in the union's arm order. Every other arm's literal test would fail, so the arm chosen and the error for a value no arm matches are unchanged. A typed capsule, an accessor or an inherited discriminant still takes the tests arm by arm. Unions with fewer literals emit the same code as before.