Re: [w3c/IndexedDB] Allow sorting within indexes (#138)

Key order can't be changed, so your choices today are more careful querying or modifying the data before it is indexed. "Order by A ascending, B descending" is a pain. Easiest (I think) is an index on A, and a compound key index  [A,B]; do a unique cursor walk over A and for each A found use another cursor with a prefix range in reverse order on the compound index. 

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