Thread requires argument even when not providing 'userdata'

[EduardoLemos567]

OS: Windows 7 SP1
Godot version: 3.2

Bug:
When you call Thread.start using a method which doesnt accept arguments, the following error occurs:

E 0:00:00.431 _start_func: Could not call function 'work' to start thread 4788: Too Many Arguments.
<C++ Error> Method failed.
<C++ Source> core/bind/core_bind.cpp:2694 @ _start_func()

Example code:

extends Spatial

var _thread = Thread.new()

func work(): 
	print('done')

func _ready():
	_thread.start(self, "work")

Probably the internal call try to pass some argument and since work() doenst accept, it throws that error.
The code bellow runs fine:

extends Spatial

var _thread = Thread.new()

func work(abc): # <---
	print('done')

func _ready():
	_thread.start(self, "work")

[Calinou]

This is documented on Using multiple threads, but it doesn't explain why the userdata parameter must always be specified.

[EduardoLemos567]

I overlooked the doc (my mistake) about the Thread.start(), it was there:

Starts a new Thread that runs method on object instance with userdata passed as an argument. The priority of the Thread can be changed by passing a value from the Priority enum.

Returns @GlobalScope.OK on success, or @GlobalScope.ERR_CANT_CREATE on failure.

Maybe making it more clearer (like the tutorial you linked):

Starts a new Thread that runs method on object instance with userdata passed as an argument (even if no userdata argument is passed, the method must accept one argument and it will be null). The priority of the Thread can be changed by passing a value from the Priority enum.

Returns @GlobalScope.OK on success, or @GlobalScope.ERR_CANT_CREATE on failure.