1st minor: there are a bunch of unnecessary type-casts, I'd like to remove those if no one objects. For example, in MutableInteger, this cast to long is superfluous:
public long longValue() { return (long) value; }
That sounds right, perhaps these casts were just an oversight.
2nd: There is no MutableNumber class. It seems to me that the mutable number classes are paralle to java.lang.Number classes and should therefore also be subclasssed from a MutableNumber.
Originally, there was such a class, but after some analysis and refactoring, it wasn't really doing anything and was nominated for removal. However, I understand your point. If MutableNumber were to be resurrected, it would serve only as a marker interface. I'm fine with that.
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