Returns the current value for the given storage key. If the key is not set (undefined) the fallback value will be returned instead.
Returns true if the storage object contains a value for the given key
Removes a given key from the storage list
Sets a given value to a given key in the storage
Removes a given callback as watcher for the given storage key
Registers a callback which is executed every time the key's value has changed NOTE: Changed means changed. If the value is the same as before the callback will not be triggered!
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Iteration for the storage