JSON failure

[jayvdb]

I added an output_format: json step to my CI, and it has failed three times
jayvdb/jayvdb@0969aaf
It is simpler than the SVG settings, so it is a bit surprising that it failed when the SVG was happily building.

When I remove 'indepth', I get a different error

Error: Converting circular structure to JSON
--> starting at object with constructor 'Object'
| property 'question' -> object with constructor 'Object'
--- property 'answer' closes the circle
Error: Process completed with exit code 1.

Removing StackOverflow fixed that.

[lowlighter]

There is probably a circular reference somewhere which is why JSON.stringify fails

[lowlighter]

This should have been fixed by:

• fix(app): improve handling of JSON output (remove circular values, spread Map/Sets/Arrays) #623