C# Vector2I inconsistent rounding behavior

[AlexTheRegent]

Godot version

v4.0.1.stable.mono.official

System information

Windows 10

Issue description

In C# Vector2I conversion produces inconsistent rounding behavior. GD.PrintS((Vector2I)(new Vector2(0.5f, 0.51f)), (int)(0.5f), (int)(0.51f)); will print (0, 1) 0 0 (note that y component is rounded to 1). On the other hand, such conversion in GDScript produces consistent result, both print(Vector2i(0.5, 0.51)) and print(Vector2i(Vector2(0.5, 0.51))) will output (0, 0).
It looks like Vector2I conversion in C# uses Round() instead of Truncate() (taking into account negative values).

Steps to reproduce

Run following codes in C#:
GD.PrintS((Vector2I)(new Vector2(0.5f, 0.51f)), (int)(0.5f), (int)(0.51f));
and GDScript:
print(Vector2i(0.5, 0.51)) and print(Vector2i(Vector2(0.5, 0.51)))
then compare results.

Minimal reproduction project

N/A

[Xinhao0709]

It seems like this is due to the inconsistent behaviors between the rounding behaviors of the Vector2I conversion for C# and GDScript. We can try to use same rounding method in both languages and see if we can fix the problem.