[Request] - define either value or key not existing as expected value

[acfischer42]

Is your feature request related to a problem? Please describe.
When there is a key that is requested to be at Default value, there are two possible passing scenarios:

• either key is not existing, hence default value
• or key is existing with the setting spelled out.

Example:

2.5.141	AllowPopups	None			yes	FALSE

AllowPopups should be set to "yes" which is the default value.
if it is set to "no" that should result in FALSE
if it is set to "yes" that should result in TRUE
if it is not existing, that should also result to TRUE

Describe the solution you'd like
I would like to have this automatically detected, but I guess that is unrealistic.
best I can think of is to have another column in the configuration that specifies if expected value is default value and evaluate that in the program - if default expected and key not existing then pass the test with TRUE.
if key exists then evaluate like today.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.