Add header action: Undefined array key "on"

[Toutouwai]

The docs for Inputfield::addHeaderAction() say that for a "toggle" action, the on setting has a default value of false. This implies that it's not required to define the on setting when false is desired.

But if this item is omitted from the settings array there is an error notice:

Undefined array key "on" in ...\wire\core\InputfieldWrapper.php:1087