JSON stringify bug with prototype conflict

index.js

'use strict';

// Observed in Node v4.5.0 and v5.0.0
// Does not appear to affect Node versions >= 6.x
const Thing = function(input) {
  this.value = input;
  
  Object.defineProperty(this, 'nonEnum', {value: 'this should not serialize'});
};
Thing.prototype.nonEnum = 'Overwrite the nonEnum to trigger the bug';

const thing = new Thing('my value');

JSON.stringify(thing);
// '{"value":"my value"}'

JSON.stringify(thing, null, null);
// '{"value":"my value","nonEnum":"this should not serialize"}'