Working with big numbers

I’ve uploaded to the Database Exchange a procedure called Big Number which performs any of five arithmetic operations on operands which, in general, may contain twice as many significant digits as can normally be used in Panorama X floating point arithmetic. Its purpose is permit the user to work with much larger numbers than usual. The procedure is accompanied by full documentation.

Information for anybody has downloaded this procedure:

It had a bug which I’ve fixed so you should download it again. Which reminds me of this message that I tripped over recently: