Re: [IndexedDB] Introduce a more general query mechanism beyond keys/ranges (#45)

When considering this, we really need to think about what pieces we'd rather leave to libraries, and which ones we should build in to the API.

For the first two use cases in the previous comment, I think an SQL database would create a temporary table and insert results in that table.

We could do something similar and add APIs on the transaction object for creating a temporary btree or hash table and then allow reading/writing in that.

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