LuaCoroutine ResumeAsync pushes wrong arguments on the stack

[CodeSmile-0000011110110111]

I've noticed I was getting the wrong arguments in my coroutine when using a custom StartCoroutine method that is supposed to take a LuaFunction, create a coroutine and resume it right away to closely model Unity coroutines:

private static readonly LuaFunction _startCoroutine = new(nameof(lunyscript_instance.StartCoroutine), async (context, buffer, ct) =>
{
  var instance = context.GetArgument<lunyscript_instance>(0);
  var function = context.GetArgument<LuaFunction>(1);
  
  var routine = new LuaCoroutine(function, true);
  var resultCount = await routine.ResumeAsync(context, buffer, ct);
  ...

I call it like so:
script.component:StartCoroutine(luaCoroutineWithArgs, 111, 222, 333)

I also tried changing my binding to this:

var instance = context.GetArgument<lunyscript_instance>(0);
var function = context.GetArgument<LuaFunction>(1);
var routine = new LuaCoroutine(function, true);
var args = NoArgs;

if (context.ArgumentCount > 2)
{
	args = new LuaValue[context.ArgumentCount - 2];
	context.Arguments.Slice(2).CopyTo(args);
}

var firstResults = await routine.ResumeAsync(context.State, args, ct);
for (int i = 0; i < firstResults.Length; i++)
	Debug.Log($"coroutine result[{i}] = {firstResults[i]}");

This calls a different overload of ResumeAsync.

Debugging this it seems that due to the "object" parameter (the object + the function + the three arguments) the resume method thinks I'm passing in a vararg because variableArgumentCount is 1.

var variableArgumentCount = Function.GetVariableArgumentCount(context.ArgumentCount - 1);

The Lua function signature:
function luaCoroutineWithArgs(arg1, arg2, arg3)

But the stack has 5 values. One function, three args, therefore 1 vararg is assumed.