Groups of arguments binded with chained Callable.bind calls are appended in reversed call order

[kleonc]

Godot version

4.0.alpha11

System information

N/A

Issue description

Currently callable.bind(a1, a2).bind(b1, b2) is equivalent to callable.bind(b1, b2, a1, a2). I think it should be equivalent to callable.bind(a1, a2, b1, b2).

Steps to reproduce

Run this script:

@tool
extends EditorScript

func _run():
	f.bind(1, 2, 3).call(0)
	f.bind(1, 2).bind(3).call(0)
	f.bind(1).bind(2, 3).call(0)
	f.bind(1).bind(2).bind(3).call(0)
	
func f(a, b, c, d) -> void:
	prints(a, b, c, d)

Output:

0 1 2 3
0 3 1 2
0 2 3 1
0 3 2 1

Expected output:

0 1 2 3
0 1 2 3
0 1 2 3
0 1 2 3

Minimal reproduction project

No response

[cdemirer]

Technically, this is documented behavior.

But I agree that it's not intuitive (especially when following Python terminology).

[vnen]

I'm not sure why it's like this. It seems to be used in the engine like this internally for connecting signals. In any case, need to be discussed with core team too.

[vnen]

So, this is not really a bug, it's just the way bind() works. That is, it always bind the last arguments. Taking that into account it is really expected behavior. A Callable for a function with 2 parameters is the same as a Callable for a function with 4 parameters that has 2 bound arguments, so it shouldn't reorder the already bound ones.

[AThousandShips]

Closed by #76158 clarifying the order, if you want to change the behaviour please open a proposal for this as it is intended behaviour and would break compatibility

[YuriSizov]

Yeah, I agree.

[AntonBogun]

While this is documented behaviour, it doesn't seem to be "right" behaviour. I want my bind to act in the "first argument bound comes first" way, but it seems there isn't any way to extend Callable to add an "alt_bind()" or something like that.
I suppose this isn't that big of a deal but I would still greatly prefer not having to think backwards about my arguments. I will try to inverse this by creating a singleton and seeing how that goes, but it would be preferable to have a built-in alternative bind that works as one would expect.
If there is any other solution to this I'm unaware of, please let me know.