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Json keys #7944
Also document a bit the type-safe way to parse JSON (I don't think it was documented before, and mapping/serializable doesn't count because it doesn't talk about primitive types, Array, Hash, etc.)
I decided to only provide out-of-the-box serialization of json object keys for ints and floats, because their text representation is pretty obvious. Other types are more controversial but could be provided by shards.