Objects

Is an objectIs an instance ofIsn't an instance of

static function(Assert $assert) {
    $assert->object($someValue);
}

static function(Assert $assert) {
    $assert
        ->object($someValue)
        ->instance($someClass, 'Optional error message');
}

static function(Assert $assert) {
    $assert
        ->object($someValue)
        ->not()
        ->instance($someClass, 'Optional error message');
}