Removes the given element and any elements subsumed by the given element.
Required. Default implementation provided.
- Xcode 8.0+
- Swift Standard Library
The element of the set to remove.
For ordinary sets, an element equal to
member is contained in the set; otherwise,
nil. In some cases, a returned element may be distinguishable from
new by identity comparison or some other means.
For sets where the set type and element type are the same, like
Option types, this method returns any intersection between the set and
nil if the intersection is empty.