Types prefixed by a ?

[OB1_canbeno]

In various snippets of Verse code I’ve seen formal argument and return value types prefixed with a question mark. E.g. ?creative_prop in SpawnProp. I cannot find out what it means. Firstly please tell me, and secondly can this explanation be added to the Verse Language Reference pages.

Thank
Andre

[Incredulous_Hulk (Kurtis Schmidt)]

There are a couple uses of the ? character in the Verse language.

Option types (ex: Prop:?creative_prop):

Option

Optional named function parameters (ex: MyFunc(?Y:int = 5):void):

Functions