The base implementation of `_.unset`.

@private
@param {Object} object The object to modify.
@param {Array|string} path The path of the property to unset.
@returns {boolean} Returns `true` if the property is deleted, else `false`.
function baseUnset(object, path) {
  path = isKey(path, object) ? [path] : castPath(path);
  object = parent(object, path);

  var key = toKey(last(path));
  return !(object != null && hasOwnProperty.call(object, key)) || delete object[key];
}