Hi @ll,

Now that 5.0.3 is out, maybe it's time to bring back that
 old problem left in May: type hints and null default values.
This feature was dropped since no one could come with a
 reasonable solution.
So, for now, there is no (engine) way to have a parameter that
 can only be of some class or null. Am I right ?
The use of null (I know it's not a value it's a type...) is 
 justified because we don't have a "value" to represent 
 a NULL OBJECT(or NO OBJECT).
IMO, this is a necessary feature (maybe others thing this way
 too) and that's why I brought it back.

Cristiano Duarte

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