'Switch' Custom Field Element Cannot be Defaulted to "On"

Hi there,
I recently wanted to use the 'Switch' element in a custom post type as documented here: https://docs.metabox.io/fields/switch/.

I added a switch element to my array of custom fields like this:

[
'id'        => 'enable_switch',
'name'      => 'Enable This',
'type'      => 'switch',
'style'     => 'square',
'on_label'  => 'Enabled',
'off_label' => 'Disabled',
'std'   => true,
],

However, the 'std' => true, attribute is never respected to default the switch to an "on" status. This attribute is what is used by your Metabox builder as the "ON by Default" PHP output.

I have also tried a range of other permutations such as 'std' => 1, OR 'std' => 'Enabled', but none of these seem to work either?

Is this a bug? Or am I unaware of the correct method to default the switch to an "on" status?

I look forward to your response.