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Fix: 90616277e3 (r168784389)
Because the `depth` counter is inside `JSON::State` it can't be used
concurrently, and in case of a circular reference the counter may be
left at the max value.
The depth counter should be moved outside `JSON_Generator_State` and
into `struct generate_json_data`, but it's a larger refactor.
In the meantime, `JSON::Coder` calls `State#generate_new` so I changed
that method so that it first copy the state on the stack.
https://github.com/ruby/json/commit/aefa671eca