Passing data between GD.yield() and resume()

[gilzoide]

Discussed in #13

^{Originally posted by Alikae January 27, 2022}
Hi !
I would like to know if there is currently a way to pass data between between GD.yield() and the corresponding resume().
All my tests so far behave as if GD.yield() always return nil, regardless of how I call resume().

Wanted usage:
script a:

b.test()
b.resume('data')

script b:

function test()
a = GD.yield()
print(a) -- print data

Is there something I missed about how to use it ?
Is this maybe not an intended feature ? The wanted behavior is easily reproduced by changing

b.resume('data')

by

b.some_prop = 'data'
b.resume()

Lastly, I came to the sources to try to understand it by myself, but I stumbled upon coroutine.resume and coroutine.yield, that (in my understanding) doesn't seems to be defined anywhere. Does it come from Godot API ? If so, do you know where I can find some documentation about it ? Pretty hard to find Godot documentation that do more than scratching the surface.

[gilzoide]

This is most likely because of the lack of a return at the end of GD.yield:

godot-lua-pluginscript/src/late_globals.lua

Lines 132 to 133 in b2100ff

	coroutine_yield(co_obj)
	end