Re: [w3c/IndexedDB] Allow more explicit control over transaction lifetimes (#34)

TPAC 2019 Web Apps breakout:

Looked at two proposals:

* On `IDBTransaction` add `waitUntil(promise)`. Can be called multiple times. Try redefine autocommit behavior in terms of these promises resolving (i.e. unify requests and promises). 
* On `IDBDatabase.transaction()` add an option `manualCommit: true`; `commit()` must be called explicitly. 

Notes:

* Expect most usage to be by wrappers/libraries.
* Attendees were pretty split - explicit commit is more like traditional database APIs, promises build on SW/WebLocks patterns and reduce risk of coding deadlocks 
* Using either option puts the transaction into a new mode where new requests can be made at any time.
* At first glance, seems like either option can be polyfilled on the other

Next steps: make concrete proposals; reach out to library authors to get feedback on preferences


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