@RaiyanC: Looks like issues in the manual: see a summary here.

You can reproduce all this locally with DigraphsTestManualExamples(); or at least I could!

The first thing is to note that generally tests only give the first line of an error, so

gap> b[1][1] := 534;
Error, List Assignment: <list> must be a mutable list
not in any function at *stdin*:39
type 'quit;' to quit to outer loop    

should actually just be

gap> b[1][1] := 534;
Error, List Assignment: <list> must be a mutable list

Also watch out for trailing whitespace, e.g. weights.xml line 28, which is 96 characters long (mostly just spaces at the end of the line).

Fix these, and see what else pops up. If you can get DigraphsTestManualExamples() passing locally, then most of this stuff should be fixed in the pull request.

Reminder: you can update this pull request by simply pushing more commits to your fork's AddingEdgeWeightedDigraph branch.

Added EdgeWeights attribute, EdgeWeightedDigraph global function with additional utility functions as well as documentation, manual examples and testing.

@RaiyanC: you could merge or rebase on main now. I pushed a quick fix to that bug you discovered.

I'm fixing this up to hopefully merge this week. Sorry we've waited so long!

I'm satisfied that this passes, and that all @james-d-mitchell's last suggestions have been acted on.

Suggest merging.