Is `std` not support for select/select_advanced fields?

I'm trying to get a drop down menu pre-filled with a default value, but it looks like both the select and select_advanced field types ignore this common setting?

Example code below is based on the example on the docs:
https://docs.metabox.io/fields/select-advanced/

array(
    'name'        => 'Select Advanced',
    'id'          => 'select_advanced',
    'type'        => 'select_advanced',
    'placeholder' => 'Select an Item',
    'options'     => array(
        'java'       => 'Java',
        'javascript' => 'JavaScript',
        'php'        => 'PHP',
        'csharp'     => 'C#',
        'objectivec' => 'Objective-C',
        'kotlin'     => 'Kotlin',
        'swift'      => 'Swift',
    ),
    // This doesn't seem to work
    'std' => 'php'
)

Tested this in v5.2.10 (via composer).

How can I set the default option of a select element?