This brings me back to when I worked on Excel. The formatting structs (and most cell related ones) are so tightly packed and the byte code VM for the formulas is pretty neat.

I wish I could have met duanec, that guy wrote probably 10% of the code for Excel. Sadly he had retired 2 years before I started working on Excel.

Fun fact: when they were about to ship Excel 1.0, they didn’t know what to name it then so they had an internal poll. The name that garnered the most votes was “Mr Spreadsheet”. Needless to say, marketing vetoed it.