code: async function evalRemoteMethod(path, args) {
    let [parent, obj] = objectAndParentGivenPath(path);
  
    let result = obj;
    if (obj && typeof(obj) === 'function') {
      d("obj is function!");
      let res = obj.apply(parent, args);
  
      result = res;
      if (typeof(res) === 'object' && res && 'then' in res) {
        d("result is Promise!");
        result = await res;
      }
    }
  
    return result;
  }
docs: Given an object path and arguments, actually invokes the method and returns
  the result. This method is run on the target side (i.e. not the one doing
  the invoking). This method tries to figure out the return value of an object
  and do the right thing, including awaiting Promises to get their values.
  
  @param  {string} path  A path to the object to execute, in dotted
  form i.e. 'document.querySelector'.
  @param  {Array}  args  The arguments to pass to the method
  
  @return {Promise<object>}      The result of evaluating path(...args)
  
  @private