* `json`: `ImpliedType` now returns an error if a JSON object contains two properties of the same name. As a compatibility concession it allows duplicates whose values have the same implied type, since it was unintentionally possible to combine `ImpliedType` and `Unmarshal` successfully in that case before, but this is not an endorsement of using duplicate property names since that makes the input ambiguous in any case. ([#199](https://github.com/zclconf/go-cty/issues/199))
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