Tested with a subclass in my project (see related issue) and it appears to be working:

var script = """[["a", "b"]] | array.each @(do; ret $0 | array.join("#"); end)""";

var context = new FixedTemplateContext();
var result = Scriban.Template.Evaluate(script, context);
Console.WriteLine(context.ObjectToString(result));

Correctly outputs:

["a#b"]

Tested with a subclass in my project (see related issue) and it appears to be working:

Could you add this as a test in TestRuntime.cs so that we capture the case and avoid regressions?

There is a stack overflow happening in the tests.

Unfortunately I cannot compile the project due to SDK version mismatch,

You have to install .NET 10 in order to run the tests locally.

will see what I can do, thanks

Thank you!