Selected columns

Disable plugin bootstrap if you want to keep CakePHP's core decimal mapping:

// Inside Application::bootstrap(), after parent::bootstrap().
$this->addPlugin('CakeDecimal', ['bootstrap' => false]);

Register a separate type alias in config/bootstrap.php:

use Cake\Database\TypeFactory;
use CakeDecimal\Database\Type\DecimalObjectType;

TypeFactory::map('decimal_object', DecimalObjectType::class);

Set the alias in the table's initialize() method:

public function initialize(array $config): void {
    parent::initialize($config);

    $this->getSchema()->setColumnType('total', 'decimal_object');
}

This changes ORM conversion for total; it does not alter the database column. Other decimal columns continue using the core type.

Apply options to TypeFactory::build('decimal_object') when using this alias. Configuring decimal would configure the core type instead.