Add the key to the set if it is not already there. Do nothing silently if already there. The key must be one allowed by this store. For example a scalar store only allows primitives and remotables.
Remove the key. Throws if not found.
Check if a key exists. The key can be any JavaScript value, though the answer will always be false for keys that cannot be found in this store.
Add the key to the set if it is not already there. Do nothing silently if already there. The key must be one allowed by this store. For example a scalar store only allows primitives and remotables.