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Cloning takes constant time, regardless of the size of the map.
PersistentMap.put(K key,
V value)
Creates and returns a new
PersistentMap identical to
this one, except it contains a mapping from
key to
value.
Put all the mappings in the given map into this map, throwing
out conflicting mappings from this set as necessary.
Make a new
PersistentMap identical to this one,
except that it does not contain a mapping for
key.
Put all the mappings in the given map into this map, throwing
out conflicting mappings from this set as necessary.