Is your feature request related to a problem? Please describe.
Members are serialized in the order returned by reflection, with members of base types coming last, which is sometimes not desirable.

Describe the solution you'd like
Remove sealed from ReadablePropertiesTypeInspector and and from ReflectionPropertyDescriptor.

And extract ReflectionPropertyDescriptor to a top-level class (see Additional context), or make protected.

Describe alternatives you've considered
Copy/paste ReadablePropertiesTypeInspector and tweak the order.

Additional context
WritablePropertiesTypeInspector can be also later refactored to share code with ReadablePropertiesTypeInspector.