Re: [w3c/IndexedDB] API to enumerate databases (#31)

I reckon no attempt needs to be made to ensure the results remain valid after the function call returns values. I would suggest leaving it up to the application author to deal with it.

That said, a separate function like hasDatabase(name) would be useful, with the proviso that other open/create requests for the same name would be queued until after the current code finishes dealing with IndexedDB (I'm not familiar with the implementation enough to suggest a specific mechanism for this).

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