Could we have a NSDocument.init() that throws in the next macOS? That would 
translate to a "initWithError" in Objective C (I think). It would be the new 
primary initializer, with the current one calling it and dropping any error to 
oblivion.

This doesn't make any difference to Objective-C subclasses, which can use any 
parent class initializer, but would help in Swift, which needs store and 
release any "init" errors.

Sent from my iPhone
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