In a other comment I have suggested that the author of the original post look at Lotus Improv (and Quantrix Modeler, two spreadsheets from the nineties that wer

In a other comment I have suggested that the author of the original post look at Lotus Improv (and Quantrix Modeler, two spreadsheets from the nineties that were way ahead of their time for keeping data and formulae distinct. This obviates the need for topological sorting as described because the dataflow aspect of the sheet being worked on is always very explicit and clear.