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Missing or NULL class union

Note

Updated 2021-02-04.

Examples

showClass("missingOrNULL")
#> Virtual Class "missingOrNULL" [package "AcidBase"]
#> 
#> No Slots, prototype of class "NULL"
#> 
#> Known Subclasses: 
#> Class "NULL", directly
#> Class "missing", directly
#> Class ".NULL", by class "NULL", distance 2, with explicit coerce