Looking at the source ARef.java, I see that the validate method will throw an IllegalStateException if the validator function either returns false or throws a non-RuntimeException. The setValidator method immediately validates the Ref using the new validator function. It always throws a RuntimeException when validation fails. Why doesn't it just allow the exception thrown by the validate function to propagate out instead of wrapping it in a RuntimeException? That would make it have the same result as calling validate.
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