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Read the [JsonUtils Spec] for more details. This pull request introduces the next version of JsonUtils. It is in a separate file for ease of review and testing. JsonUtilsNew will be renamed in a subsequent commit that rewrites our JSON deserializers. ### Implementer's Notes I went with telescoping exceptions for the key parsing code, because it's totally possible that you can be five keys deep and encounter a type error. This lets us encode information about all failures in the chain instead of just the topmost one. The original JsonUtilsNew code changed to use `decay` everywhere because the tests wouldn't compile. We want to treat `GetValue<const guid>` _the same as_ `GetValue<guid>`, and this lets us do so. `decay` is awesome. I've been developing this with a shim that redirects `JsonUtils.h` to `JsonUtilsNew.h`. I am not comfortable deleting the original until we've moved off of it, and that _will_ be the subject of a followup PR. ## Validation Steps Performed So many tests. [JsonUtils Spec]: https://github.com/microsoft/terminal/blob/master/doc/cascadia/Json-Utility-API.md Refs #2550 |
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