@filmor @lostmsu @amos402 I am still working on the implementation here (the ToAction method throws a memory corruption error in py_action.Invoke) but would appreciate some preliminary review to make sure I'm headed in the right direction. Thanks!

allow_threads in methodbinder.cs Invoke is true which is causing the memory corruption. If I set it to false there is no corruption so I need to look into why. This looks like it may be new code

Not suggesting this readonly implicit conversion, what if I want to use like this

void AddElem(IList<int> lst)
{
    lst.add(10);
}

def func():
    lst = [1, 2, 3]
    AddElem(lst)
    # I want [1,2,3,10] actually

I suggest implement some subclasses from List<> so you can track the changes of the collection and apply them to the Python's list
Also the test didn't check any outputs, it only certify the runtime has no exceptions.

@amos402 see the latest changes. I'm dealing with some crash/exception in native code but I think I'm going in the direction that you are proposing.

@lostmsu since we last spoke I looked into codec and it looks like string encoding, so I'm not sure how it could apply to method binding. What is your preferred way to support non-automatic conversions for me to consider/try?

Opened #1022 for my take on generic approach.

This is superseded by #1084 and #1080