goog.storage.CollectableStorage

Also remove invalid keys.

List of all keys.

Also remove invalid keys.

a list of expired keys.

The key to get.

Deserialized value or undefined if not found.

The key to get.

If true, return expired wrappers as well.

The wrapper, or undefined if not found.

The key to remove.

The key to set.

The value to serialize to a string and save.

The number of miliseconds since epoch (as in goog.now()) when the value is to expire. If the expiration time is not provided, the value will persist as long as possible.