Optional
A callback function that will be called when an entry is deleted.
Entries are considered deleted from the set when:
set.delete()
set.batchDelete()
set.add()
set.batchAdd()
set.replace()
set.clear()
set.dispose()
A callback function that will be called when an entry is deleted.
Entries are considered deleted from the set when:
set.delete()orset.batchDelete()entries.set.add(),set.batchAdd()orset.replace()causing old entries being deleted.set.clear()is called.set.dispose()is called.