Re: [w3c/IndexedDB] How a transaction is implemented as a queue hang (#291)

The transaction processing model is somewhat underspecified (and has been the case since the initial IDB spec); the relevant text is in https://w3c.github.io/IndexedDB/#transaction-scheduling and https://w3c.github.io/IndexedDB/#transaction-lifecycle which rather informally defines the preconditions for a transaction to start.

Ideally, the spec would define transaction scheduling e.g. as a [parallel queue](https://html.spec.whatwg.org/multipage/infrastructure.html#parallelism). The steps are not run synchronously with any agent's (document's/worker's) event queue.

PRs that firm up transaction behavior here would be welcome.


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