Override default in child schema should not re-define the same property in the child's generated class

[saturna]

Steps:

• define parent schema with a required property my_property
• define child schema that uses extends and references parent schema
• use default keyword on my_property in the child schema

Expected behaviour:
Child class inherits my_property from parent and does not re-declare it.
Child class's constructor(s) assign my_property a default value

Actual:
Child class re-declares it's own my_property and sets it to a default value
javax.validation detects schema violations because parent.my_property is null

As a workaround I can remove my_property from parent and just make sure to declare them on every child class that has the same parent, but it feels clunky.

The use case here is to have an abstract parent type with concrete types requiring my_property to have a value.