code: function objFiltered(filter, thisArg) {
      const dst = isArray(this) ? [] : {};
      copyFiltered.call(dst, this, filter, thisArg);
      return dst;
  }
docs: filter function applied to objects and array's own properties not just indexed contents
  results in object or array
  
  @this        array or object
  @param filter  see copyFiltered
  @param thisArg if filter is function then what to use for this
  @return {object|array} depending on this passed on call