Missing or NULL class union

Note

Updated 2021-02-02.

Examples

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