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unset
Combined from primary sources listed below.

In SetHash§

See primary documentation in context for method unset. 

method unset(SetHash:D: \to-unset --> Nil)

When given single key, unset removes it from the SetHash. When given a List, Array, Seq, or any other type that does the Iterator Role, unset removes each element of the Iterator from the SetHash (if it was present as a key).

Note: since release 2020.02.