Creates a GObject.ParamSpec for a property.
The property name in kebab-case
The property type (defaults to 'jsobject')
'jsobject'
Access flag: 'r', 'w', or 'rw' (defaults to 'r')
'r'
'w'
'rw'
A GObject.ParamSpec instance
Creates a GObject.ParamSpec for a property.