function baseUnset(object, path) {
      path = castPath(path, object);
      object = parent(object, path);
      return object == null || delete object[toKey(last(path))];
    }
The base implementation of `_.unset`.

@private
@param {Object} object The object to modify.
@param {Array|string} path The property path to unset.
@returns {boolean} Returns `true` if the property is deleted, else `false`.