Under the hood
Useful1 Signal2
Notification sending can be given a storage handle, defaulting to none, so nothing changes today.
What's wrong with this entry?
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What
The notification entry point takes an optional third argument holding a storage handle and credentials, forwarded to the session-record write it does before sending on the configured channel. It defaults to empty, so behaviour is unchanged for existing callers.
Evidence
preferredNotifChannel
Strings lifted out of the shipped bundle, so the claim above can be checked against them.