Instead of "/list (/list)", it'd be nice if the first X characters of json_encode(list) was displayed instead.

Heck, have "[list]" automatically convert to json_encode(list) in general.

One caveat is that you shouldn't have to generate the whole string (for the runtime error) since only the first X characters are necessary, but it's probably fine because runtime errors shouldn't happen anyway, or maybe this behavior only applies to DEBUG mode.