/**
  Returns whether Type(value) is Object.

  Useful for checking whether a value is a valid WeakMap key.

  Refs: https://tc39.github.io/ecma262/#sec-typeof-operator-runtime-semantics-evaluation
        https://tc39.github.io/ecma262/#sec-weakmap.prototype.set

  @private
  @function isObject
*/
export function isObject(value) {
    return value !== null && (typeof value === 'object' || typeof value === 'function');
}