onnOf decoder

oneOf.js

import { oneOf, string, number } from 'jsonous';

const numberToString = number().map(n => n.toString());
const decoder = oneOf([string(), numberToString]);

decoder.decodeAny('forty-two');
// --> Ok('forty-two');

decoder.decodeAny(42);
// --> Ok('42');

decoder.decodeAny(undefined);
// --> Err('Unexpected data. Last failure: Expected to find a number. Instead found undefined');