Inspector should print [couldn't preload] and not 'null' if it fails to display variable.

[RafalLauterbach]

Tested versions

Godot Version

v4.3.stable.official [77dcf97]

System information

Arch Linux

Issue description

Today I've stumbled upon problem with inspector. I wanted to check if my dictionary of 10 arrays of 16'000 elements (~11MB json file) loaded correctly - aand (in the end it turns out) loading data works fine, but when setting up breakpoint and checking if it worked I got < null > value. But it isn't really null - it's just that inspector can't show it! < null > is uninitialized value or deleted value. This inspector should really show something other than null... because the value is not < null >, it just ran out of buffer space(?) while trying to display it.

After spending like half hour trying to find out why is my file is not loading - I figured out that it actually is loading correctly and I just wasted time looking for problem that never was here. It really should print something else than < null >.

Also the same 11MB file in text format also shows up as < null > instead of [couldn't inspect] or something... Or it could just inspect first x characters..

Other than that - it's great that inspector is robust enough to not crash whole project. It is just missleading.

Steps to reproduce

create >11MB json file.
open it and save into variables
they should be < null > , unless you have modified inspector settings, I guess.. Then it might require bigger file.

Minimal reproduction project (MRP)

var file : FileAccess;
const FILENAME = "user://test/interesting_symbol_db";
func _ready():
	if (not DirAccess.dir_exists_absolute("user://test")):
		DirAccess.make_dir_recursive_absolute("user://test");
	#make big file, somehow.
	file = FileAccess.open(FILENAME,FileAccess.READ);
	var text = file.get_as_text();
	var json = JSON.parse_string(file.get_as_text());
	file.close();
	if (json==null):
		print("json load failed") #it shouldn't trigger, even though  inspector shows json=< null >
		json = {};
	breakpoint;
	return;

#if file is >~11MB size both text and json should show < null > in inspector. It would be better if showed something less missleading.