[1.1.0] (JSON only) Serialization of TxKernel u64s as strings #2698
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As part of wallet V2 API, I'm ensuring that all u64 fields returned by the API are serialized into JSON as strings as opposed to literals, as it's not guaranteed that consumers will know what to do with a u64 literal (javascript, for instance). TxKernel is embedded in the JSON slate, so the custom serializer needs to be added to it.
Note that the API will still be able to accept literals in u64 fields on deserialization, it will just produce them as strings by default on serialization.