Re: [w3c/IndexedDB] Where unique key goes (#181)

(Note that this example dates back to the 1.0 version of the spec.)

`isbn` is used as the primary key; it is inherently unique.

Making `title` unique is a bit contrived - titles are not unique in the real world - but is explicitly called out in the introduction to the example ("This index can be used to look up books by title, and enforces a uniqueness constraint")

If you'd like to rework the examples with alternate properties and data, covering the same set of API usage, PRs welcome. 



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