Feature request: merge when de-referencing

[mitar]

If I understand correctly, $ref replaces the whole schema, not merges with things inside the schema object? So you cannot do {title: 'foobar', $ref: '#/properties/foobar'} and have title be kept? Could this be an optional thing to enable? To allow any fields besides $ref inside the schema object to extend (override) ones you get from $ref?