public ImmutableCharDoubleMap newWithKeyValue(char key, double value)
{
MutableCharDoubleMap map = new CharDoubleHashMap(this.size() + 1);
map.putAll(this);
map.put(key, value);
return map.toImmutable();
}
public ImmutableCharDoubleMap newWithoutKey(char key)
{
MutableCharDoubleMap map = new CharDoubleHashMap(this.size());