Function castType

Dummy function that casts a type for the remaining scope.

function (aOrB:"A"|"B") {

	if (aOrB.includes("A")) {// non narrowing condition
		castType<"A">(aOrB)
	} else {
		castType<"B">(aOrB)
	}
}

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Ideally this would return the value as well, but due to #34636 and #40562] this cannot be expressed in the type system.