Function isChildWindowKey

src/injected/web/gm-global-wrapper.js:64–67

const inheritedDesc = createNullObj();

const isChildWindowKey = key => isString(key) /* skipping Symbol as it throws on conversion */
  && (key = +key) >= 0 /* is number */
  && (key === (key | 0)) /* is 32-bit integer, no fraction */
  && key < window::getWindowLength();

const updateGlobalDesc = name => {
  let src;