[vim9script] Default value for object argument?

How do you define a default value for a function argument whose type is
a class? I have tried this:

vim9script

class X
endclass

def F(x: X = null_object)
enddef

F()

But this results in:

E1013: Argument 1: type mismatch, expected object<X> but got object<Unknown>

Maybe this is not supported yet?

Thanks,
Life.



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