Do not throw Error object from Result.withException

Typescript requires that the input to `new Error` be a string. The
withException function was passing data typed as `any` to the Error
constructor, meaning non-string values were definitely accepted. Since
we want to be able to throw any kind of error data, don't use Error.

Author: Elias Mulhall

src/result.ts

@@ -89,7 +89,7 @@ export const withException = <V>(r: Result<V, any>): V => {
   if (r.ok === true) {
     return r.result;
   } else {
-    throw new Error(r.error);
+    throw r.error;
   }
 };