proxy: refactor json parsing #9013
Draft
+684
−134
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Problem
current json parsing is a little bit expensive with untagged enums and intermediate allocations
Summary of changes
write custom deserialize impls to avoid untagged enum cost, and try and remove some intermediate allocs.
I eventually want to move to using DeserializeSeed to use an arena and to remove the need of serde_json::Value during parsing entirely.
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Checklist before merging