`SomeModel.getById` with projection doesn't assign default value if db doc doesn't have projected field

[etsuo]

For example, if you have SomeModel and it has a property address:Address = new Address(), and you do the following:

SomeModel.getById(...)

If the document does not have the address field, the resulting object will return an object missing that field rather than returning an object with the default value of that field.