UserTypeProperty::convertTo

static function convertTo(FieldType $fieldType, $value, $toTypeClass)
	{
		if (is_array($value) && isset($value['VALUE']))
			$value = $value['VALUE'];

		$value = (string) $value;
		//BaseTypeString was removed for PHP7 compatibility
		if (class_exists('BitrixBizprocBaseTypeStringType'))
			return BaseTypeStringType::convertTo($fieldType, $value, $toTypeClass);
		return BaseTypeString::convertTo($fieldType, $value, $toTypeClass);
	}