public function mergeConstraints(self $source)
    {
        if ($source->isGroupSequenceProvider()) {
            $this->setGroupSequenceProvider(true);
        }

        foreach ($source->getConstraints() as $constraint) {
            $this->addConstraint(clone $constraint);
        }

        foreach ($source->getConstrainedProperties() as $property) {
            foreach ($source->getPropertyMetadata($property) as $member) {
                $member = clone $member;

                foreach ($member->getConstraints() as $constraint) {
                    if (\in_array($constraint::DEFAULT_GROUP, $constraint->groups, true)) {
                        $member->constraintsByGroup[$this->getDefaultGroup()][] = $constraint;
                    }

                    $constraint->addImplicitGroupName($this->getDefaultGroup());
                }

                $this->addPropertyMetadata($member);

                if ($member instanceof MemberMetadata && !$member->isPrivate($this->name)) {
                    $property = $member->getPropertyName();

                    if ($member instanceof PropertyMetadata && !isset($this->properties[$property])) {
                        $this->properties[$property] = $member;
                    } elseif ($member instanceof GetterMetadata && !isset($this->getters[$property])) {
                        $this->getters[$property] = $member;
                    }
                }
            }
        }
    }