Present state of incompletion.

[PowerUser1234]

It seems that

division, by means of longest extent number MathContext is not implemented,
preincrement, predecrement, postincrement, postdecrement are not implemented,
the five augmented assignment operators are not implemented.
+=, -=, *=, /=, %=

Sadly, this library isn't useful until it is finished in these areas too!

[PowerUser1234]

The other thing is, despite System.identityHashCode, certainly,
if the data comparison of != has been overridden, that by logic == should be similarly,
which, by implication, means overridden as well. :)