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