use None - that is effectively what you need.  
unless of course None is valid in your data set.  

-- 
Anthony Flury
email : anthony.fl...@btinternet.com
Twitter : @TonyFlury

> On Jul 25, 2022, at 10:43 AM, Михаил Крупенков <kno3.2...@gmail.com> wrote:
> 
> 
> Yes, I want that when Void is received in a function parameter it is not 
> processed:
> 
> func(Void) == func() == "default"
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