public ImmutableCharCharMap newWithKeyValue(char key, char value)
{
MutableCharCharMap map = new CharCharHashMap(this.size() + 1);
map.putAll(this);
map.put(key, value);
return map.toImmutable();
}
public ImmutableCharCharMap newWithoutKey(char key)
{
MutableCharCharMap map = new CharCharHashMap(this.size());