Jackalope\Property::setValue PHP Method

    public function setValue($value, $type = PropertyType::UNDEFINED)
    {
        $this->checkState();
        // need to determine type to avoid unnecessary modification
        // don't try to determine if the value changed anyway (i.e. null to delete)
        if (PropertyType::UNDEFINED === $type && $this->value === $value) {
            $type = $this->valueConverter->determineType($value);
        }
        // Need to check both value and type, as native php type string is used for a number of phpcr types
        if ($this->value !== $value || $this->type !== $type) {
            if ($this->getDefinition()->isProtected()) {
                $violation = true;
                if ('jcr:mixinTypes' === $this->getDefinition()->getName()) {
                    // check that the jcr:mixinTypes are in sync with the mixin node types
                    $mixins = array();
                    foreach ($this->getParent()->getMixinNodeTypes() as $mixin) {
                        $mixins[] = $mixin->getName();
                    }
                    $violation = (bool) array_diff($mixins, $this->value);
                }
                if ($violation) {
                    $msg = sprintf("Property '%s' of node type '%s' is protected and cannot be modified", $this->name, $this->getDefinition()->getDeclaringNodeType()->getName());
                    throw new ConstraintViolationException($msg);
                }
            }
            $this->setModified();
        }
        // The _setValue call MUST BE after the check to see if the value or type changed
        $this->_setValue($value, $type);
    }