
 ? extend operators package

 ? Can operators have multiple types?

 ? operator/operators class? 

 ? setInverse for adding to altering .Options$operators.inverse

 ? fun2name: Move to function.tools
   

# ------------------------------------------------------
# COMPLETED:
# ------------------------------------------------------
x fun2name: given the function, it identifies the .name
   function (e1, e2)  .Primitive(">=") >===>  >=
   
