C#: `Color` default assignement is not the same as in GDScript

[GabCoolDude]

Tested versions

4.5.rc1.mono, 4.4.stable.mono

System information

Godot v4.5.rc1.mono - Windows 11 (build 26100) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (NVIDIA; 32.0.15.7688) - 12th Gen Intel(R) Core(TM) i5-12600KF (16 threads) - 31.81 GiB memory

Issue description

When creating a Color property and leaving it with the default assignment in C#, its values will default to (0, 0, 0, 0). This is not the same behavior as in GDScript, which will default to (0, 0, 0, 1).

[Export] public Color ColorCSharpBugged; // Will create a new Color with these RGB value: (0, 0, 0, 0), not the same as in GDScript
[Export] public Color ColorCSharpNotBugged = new (0,0,0); // Will create a new Color with these RGB value: (0, 0, 0, 1), same as in GDScript

Steps to reproduce

Create a new C# Script
Put a property of type Color and leave it with the default assignment
Print it out or export it

Minimal reproduction project (MRP)

color-default-assignment-csharp-mrp.zip

Click on "new_resource_cs.tres" to see the bug in action
ResourceScriptCSharp.cs is the script of the resource

[Calinou]

Changing this behavior now would break compatibility with existing projects, unfortunately.