/**
* Creates a new instance to which the given specs have been merged. In case of conflicts, the existing values are
* kept.
*
* @param self $specs
*
* @return self
*/
public function mergeWith(self $specs) : self
{
$clone = clone $this;
if (null === $clone->constructor) {
$clone->constructor = $specs->constructor;
}
$clone->properties = $this->properties->mergeWith($specs->properties);
$clone->calls = $this->calls->mergeWith($specs->calls);
return $clone;
}
