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cd30b78 improved the memory efficiency of write_json_to_file, but this
causes visible (when profiling) perf regression on my mac, which can
easily be fixed by wrapping the file in a `BufWriter`. This still bounds
peak memory usage, but keeps writing efficient.
Testing: Manual profiling with samply.
Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>