var isNumberNaN = Number.isNaN || function isNumberNaN(num) {
  // eslint-disable-next-line no-self-compare
  return num !== num;
};
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.