Function argument's default value not display in tooltips/documents when it's Array/Dictionary

[Xwdit]

Godot version

4.0.alpha12

System information

Windows11, Nvidia RTX 2060, Vulkan

Issue description

In the current version, if the default value of a GDScript function arguments is set to an array or dictionary, it will be null in tooltips and documentation.

Steps to reproduce

Just look at the script document and the tooltip when calling the fn function, the default value won't show/is null:

func fn(x = [], y = {}):
	return

Minimal reproduction project

func fn(x = [], y = {}):
	return

[akien-mga]

Still reproducible in 4.0 RC 2.

[adamscott]

Post-poned to 4.2, see my comment for details.

[dalexeev]

In the current version, if the default value of a GDScript function arguments is set to an array or dictionary, it will be null in tooltips and documentation.

This is mostly fixed by the following PRs:

• Add fallback argument hints for default values #88211
• GDScript: Improve DocGen for non-constant expressions #89738

For complex expressions, an ellipsis is displayed, but we can increase the maximum recursion level if necessary:

• In the future we may think about refactoring expression reduction (see get_script_method_list is missing defaults in some cases #66218), but for now I think this issue can be considered resolved.