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delete(m, k)
m.remove(k);
m.delete(k)
m = Map.delete(m, k)
m.pop(k, None)
m.erase(k);
unset($m[k]);
m.delete(k)
m - k
m -= k
map.remove(k);
delete $m{$k}; # also succeeds when $k does not exist in %m
(dissoc m k)
m[k]=nil