Use json-stringify-safe for json formatter

[rooftopsparrow]

Hello @TomFrost and contributors,

Wondering if you'd be open to taking on another dependency and changing the default json formatter to use json-stringify-safe to protect crashing the process when trying to stringify a circular structure?

I'm willing to make a PR if this is something you'd like.

Thanks 👍

[TomFrost]

Another good suggestion!

My only immediate concern about this would be serialization speed. I'd love to see a benchmark of JSON.stringify versus that lib-- if you wanted to convert Bristol and test that, I wouldn't be opposed!

[rooftopsparrow]

Awesome!

Since there are no benchmarking tests in Bristol right now, I'll make a PR adding some initial benchmarks to establish a baseline of performance. However, I have no clue what I'm doing in terms of benchmarking, so it'd be awesome to get some feedback on things you'd like to see benchmarked.

[MarkHerhold]

@TomFrost json-stringify-safe is infinitely faster on circular references ;)

[yknx4]

PR #41